I believe it when guys say they stand up on their SOT kayaks but the things aren't really designed for standing and I sure wouldn't buy one if that's what I planned to do with it. I'd get a canoe with outriggers or a pontoon with a place to stand or a flats boat, jon boat, etc. If it's wide enough for a middle-aged, normally-sized guy to stand up in with ease then it's too wide to paddle with ease. unless it's got a lot of surface area underwater in a V shape or a centerboard or similar. A SOT is great to get you to someplace where you can stand to fish and then get back on it way easier than you would get back into and out of a sit-inside kayak.

I owned a Drifter for about a year. It wasn't the fishing model but same hull. It paddled like a barge and the ride was wet in the butt. It was a very stable sitting platform but I never tried standing on it.

Bottom line: I'd rent/borrow/fish in and stand up in one of these a few times before I bought one.