I have a friend who has a simulator in his apartment building and we have played there a couple of times. Much quicker than a real round because you aren't walking/riding to your ball.
However, I always score better on the simulator than real life. You very rarely get bad bounces on the course. You are hitting off a mat, which is more forgiving because fat shots still fly a reasonable distance. Your lie is always good (hitting out of the rough or from the fairway is the same). For whatever reason, you rarely hit that one branch six inches wide like you do in real life. And we always just took two putts on the green and moved on. Easier than putting on a simulator.
What you should use it for is grooving a decent swing
For me, heavy shoes are not so much of an issue. Yes, they will tire you out more, but they are sometimes more stable. The most important thing you need is to ensure it is comfortable. You are on your feet for a long time and at the end of the day your legs will hurt if it isn't as comfortable as possible.
76 today with a double on 18. Played course #4. Hit 11 fairways and 11 Greens in Regulation. No birdies! Had 7 putts inside 7 feet and missed them all! It was 37 when we teed off and 44 when we finished. Had my new 5 wood today, it was butter! Played a 540 par 5, 4 wood off the tee, 5 wood for 2nd shot then Gap wedge from 76 yards to 7 feet. Missed it.