We have a 60" double vanity in our master. The house came with it, and honestly, it works great for us. I don't like a lot out on the counter anyway, so don't need that much counter space. We like having separate sinks and medicine cabinets, and it is nice when we are both getting ready at the same time. I think it really just depends how you like to use your space.

I will preface that I do not like to share the bathroom when I am in it and I do not like a lot of stuff out on my vanity top either but even if I did like to share I would prefer more counter space than a 60 inch dual vanity provides. I also believe if a bathroom only has enough area in it for a 60 inch vanity it also would only have enough area for one butt at a time as well so it would not benifit from two sinks.

We went back and forth on this as well, but decided against the double sink. Instead, we are doing a larger single sink in our 60" vanity, one mirror, and two sconces. I also hate having stuff on the counter but I do love seeing all that beautiful quartz. We generally don't get ready at the same time so for us this just works better. Plus, I'm not a fan of those tiny round sinks.

It feels cramped if it's against a wall. You'll have about 4" between you and the wall when you're at the sink. I always find myself taking a step to the side.

We are changing ours to a single sink vanity. Advantages:

More counter space

An extra drawer stack, allowing his and hers drawers

Larger drawers. We're going from 12" to 16" wide drawers with a 28" sink base

Allows you to use side sconces for better lighting

Only have to purchase one sink, one faucet, and one mirror

I think it's too small. Study the vanities you'd get in 60" size and consider your storage. That's where you'd come up short.

Also, yes, with two sinks in that size vanity, you wouldn't have much space on top ... to leave out a toothbrush container, a soap dish ... ladies want space to set out curling irons, etc.

And if you do squish in two sinks to this space, you're likely to have small sinks, which are more prone to splash-back.

And yes to a single sink giving you space for sconces on the side and saving money.

More counter space - more storage. One sink.

I am not understanding why people need a separate sink. Even if two people are actually in the bathroom at the same time, how much time does each person need a sink for - to wash one's face and brush one's teeth. Perhaps shaving. I can't think of how it is not possible to alternate the use of the actual sink. Most bathroom primping is needs a mirror. I don't need a sink for my actual grooming - i.e. face care; hair grooming, general grooming, makeup but I do need storage and counter space for all the stuff I USE for that grooming.

If you pledge to not use counter for storage, and you use small (15-17") undermount sinks, it can be done.

My condo had a 60" vanity and it was fine for the two of us. We kept everything in either the medicine cabinets or the cabinets underneath with the exception of the soap dispenser and our tooth brushes. Here's a picture of our condo sink. (This is a staged for sale pic so the toothbrushes and soap are put away)

We also shared a 60" vanity in our last apartment in NY and never found it to be a problem. What we do find a problem is the 10' vanity we have in our FL rental. That's too much space.