Last weekend (March 4-6) on the monorail, some stops were handing out masks and making everyone put on a mask before they got on (such as Contemporary and GF). At other stops (Poly), no one was enforcing and castmembers stood by while people got on without wearing masks, with no issue. So it seems spotty enforcement at best. I'm not sure if you're pro-mask and concerned that others won't be wearing them, or if you're anti-mask and trying to find out if you can avoid wearing one, but I think the answer is it really depends on the CM and situation so at a minimum I'd expect to have to put on a mask sometimes on transportation. And if you're concerned about others not wearing a mask, well - people aren't all wearing masks and many took them off as soon as the monorail left the station.
For myself I really don't care. I spent 2 years worrying about covid and protections only to get covid right after returning from marathon weekend at WDW, so now I've had it, my whole family has had it as well, and we're all vaccinated and boosted so we should be fine, for a while at least.