I have an 18 hand 2200 lbs. Percheron. I wouldn't describe him as slow and steady when he has a mind to jump right into a gait! He's very agile for his size and I've got a great stop on him.
Your inner leg muscles will get really sore until you are used to riding a couch wide horse. That's one of the biggest issues I have when riding after some time off. The walk and jog are really nice and smooth. The trot is about the same gait as a light horse galloping so that's really weird. My boy is pretty smooth but can occasionally get bumpy.
The gallop is like floating on air. We don't really use that gait much.
He can turn on a dime if he chooses, pretty interesting to watch. And he can go from a stand still right into the canter.
It's a lot of fun riding them. They don't need to be ridden heavy handed like a lot of people think. Mine works best on a nice light rein.