In the spring, the flocks you saw in winter will break up and disperse. On my home ground, it's not unusual for there to be no birds on opening day, but they move in with the spring shuffle. The season has been open since mid-March here, but I just worked the first gobbler on Sunday morning. They haven't been here until now. (I spooked him- end of story).
The habitat here is mixed pine and hardwood hills over a cultivated river bottom. They roost in the hills, nearly always near a ridge top. I think they like to get on top of the ridge when they're ready to roost, and fly horizontally to the big branches of a tree that grows down the slope. That way they use less energy getting into the tree. On Sunday, the gobbler was roosted in some big pines, but they roost in hardwoods too. As others have said, if you don't push them too much they return to the same area frequently, but not every night. Imitating a barred owl at last light will sometimes make them gobble from the roost, but morning is more reliable.
It has NOT been my experience that they fly toward their roost when spooked.
Good luck! I'm headed up to Missouri in a couple of weeks, where the beards are thick and the birds are heavy.