It's actually really hard (mentally) to do this if you don't already have a shitton of savings in the bank that you're not worried about paying rent, and aren't worried about getting a new job. For a lot of people it's harder than it sounds. But yes, gap years would be amazing.

Another thing I wish was more encouraged is part-time work. Working for a year at maybe 20 hours a week would probably pay all living expenses while you have plenty of space and time to recover and time to spend in the wilderness or beach or whatever strikes your fancy. Everyone seems to want to shovel you in as a full-time employee, and part-time seems to be looked down upon more than it should as a transition and recovery tool.