Although retrfitting existing tub spaces into showers is popular, most retrofits tend to ignore modern building codes and do not give you either a large enough shower to move around in, or a large enough drain to handle the water from the shower. You are required to bring your renovation up to current building codes, and any permitted and inspected bathroom will not pass inspection without it. And don't say that you don't plan to get it inspected, or that building to code isn't applicable in your area. It's important to be sure that things are done correctly, and it's probably even more important to any subsequent buyers to your home to know that.

A 36x36 space is the minimum for a shower, and in a master, that's really too small to say "master". The smallest shower I would want in a master is 42x42, and bigger would be better. Like 48x60. And a bench. People like the idea of being able to shower two, even if they never do.

Your current tub only has 1 1/2" drain, and all new showers need a 2" drain. If you are on a slab, that increases the difficulty and expense of the conversion. That is an important consideration if you are planning on doing anything beyond just a single conventional shower head. You want to be sure that the hand shower, rain shower, and body sprays won't overwhelm the drain and cause a flood in your home.

And, speaking of the multi point showers that are so popular, if you do want a shower with plenty of output "stuff", you need to be sure that you have the hot water production system and pressure to keep up. Most homes can handle a 3 output system, if you only use 1 or 2 of the outputs at once. If you want to run all of that and body sprays too, you will need to add in a larger water heater, and potentially, a pressure tank.

So yes, it's worth doing. But only if it's done RIGHT. A poorly sized and badly waterproofed shower conversion will not add any convenience to you or value to the home.