I'm planning on putting a GD in my prep sink for the reason you asked. I may do some composting, but I still want the GD there when I need it. The main sink will also have one.

We don't have disposals in either sink...Not allowed with our septic system. The drain baskets catch things so they don't go down the drain.

What we use our prep sink for:
washing, trimming veggies and fruit
prepping poultry
washing messy baking hands
filling pots, tea pot, and adding water to pans on the stove
adding water to baking projects
adding water to things that are microwaved
draining water off veggies, noodles, etc.
filling water pitchers
filling pet water dishes
rinsing the blender after making smoothies

...and probably lots of other things I'm not thinking of right now!

Location is everything. Ours is situated in the island across the aisle, but basically between the fridge and the rangetop. It is across the side aisle from our baking area and double oven. (It's on the corner of the island so it's accessible from the end of the island for the cooking area, and the side of the island for the baking area...Also easily accessible from the perimeter of the kitchen for those not involved in cooking or baking who need to access water. We do cooking prep and bread and pizza making on the island.

I didn't answer your question about what I use the prep sink for -- everything rhome listed and ours is in a similar location.

I love my prep sink--and many thanks to the folks here who 'talked me into it' when I hesitated!! I use mine for all prep work--washing veggies, rinsing meat or poultry, washing poultry hands or messy baking hands, and occasionally for washing a dish when the other sink is busy/full. I also use it to drain pasta or other things that have been cooking, or to draw water for cooking them. Most of the things on Rhome's list are also on mine. I like that it's on a corner across from the dishwasher, so if I have prep dishes in there, I can just snatch them up and pop them in the DW. It's also accessible from two sides since it is on the corner. I don't have a garbage disposal on the prep sink, but I do have pop out garbage can under the sink, so I can just toss veggie trimmings or whatever in there. I also have a Tapmaster on that sink, and I highly recommend it--it's great when you have chicken-y or greasy/dough caked hands to be able to turn the water on and off without having to touch anything! My prep sink is big enough to handle a big turkey, wash a cookie sheet, and do whatever the main sink does if I need it to, which is just how I wanted it. I did make a strict rule that dirty dishes do NOT get left in the prep sink by anyone not actually prepping food--that means that it's always clean and ready to go when I need to use it. :-)
Hope this helps.

Cj

Ditto the previous lists plus an additional item... this is where the "rejected" cat food cans sit until I can rinse them into the garbage disposal... thus why we are glad to have the more powerful of our two GDs on this sink...

Our prep sink is fairly small and is designed more for rinsing produce, the aforementioned cans and drinking fountain. Definitely find it handy to have two sinks during big meal prep!

This is helpful. I guess I'm also trying to figure out if it's worth the extra cost of doing a garbage disposal in that sink too? Do you feel like it would have been really inconvenient for you to do the things you do in your prep sink in your regular sink? Thanks again!

IF I had and used disposals, I'd want one in each sink. One in the prep sink for prep trimmings (other than what is saved for compost, if you do that) and one in the main sink for plate scrapings.

Garbage Disposal. To cut costs we opted to put a GD in the main/cleanup sink and not the prep sink...definite mistake! You really need to have one in both. When I peel potatoes or similar tasks, I have to go over to the cleanup sink to do it (either that or peel in the prep sink & collect the peelings and carry them over to either the cleanup sink or the trash...whose location is an even bigger mistake, btw.)

The cost of a second GD is just the cost of the electrical + the GD itself...not that much in the overall cost of the remodel. If I had it to do over, I would put a GD in both sinks (and move the trash pullout into the Prep Zone!)

no gd for us, we have a compost pile and hens, so not much goes to waste.
our prep sink is very necessary around here.
dh has a huge utility sink near his range and we use it constantly.
we use it to fill pots with water, drain pasta and veg liquids,
wash big pots, wash massive amounts of greens or whatever,
defrost things into it so there is no watery mess everywhere.
ours is also large enough to wash kids or pets if we were so inclined.
we're actually adding a third sink for handwashing and bar/coffee station.
hth!