I've been using nothing but gear-drives since day 1, of course mine are Toros and nothing but Toros with the patented, fatigue-reducing T-bar control. To give you an idea how good it is, if you ever break the silly steel T that makes up the bar, it costs 80 dollars from Toro for the part lol but you can weld it.
Far as reverse, the older ones are a bit stiff, other than that you should always operate gear-driven Wb's in the SAME gear, and I would suggest the highest or fastest, then control speed with the belts and since you have a T-bar, there is no problem. It takes practice but you eventually learn to either not get into situations requiring reverse, you learn to pull the Wb by hand, or you do like I do and back up like a champ while still standing on the Velke (you're not supposed to in case it jack-knifes).
I ain't paying more for crap, Toro gear-drive T-bar, you can try a hydro Toro but money-wise the standard is the best choice.
They break one, maybe two belts a year, $50 each. Some can go for years on a belt, especially the lighter fixed decks.
Don't know nothing about fatigue, the handheld blower or the weedeater tires me out far worse.