To me it just feels like a chore--and I have enough of those in real life. The original BGs allowed resting as needed, with only the occasional random encounter as a deterrent. I really don't think this was the way to diverge from the earlier games. I'm not seeing the fun at all. With concentration, disadvantage, and random failure already limiting the effectiveness of casters who need to prepare spells, I don't see at will resting as a problem. The interruption caused by camping is a sufficient deterrent.
Edit: because typing is hard
