I am very afraid of these people

Second to those are people who listen to TOOL on shuffle. Some albums are meant to be enjoyed from beginning to end...

What TOOL album would you recommend? I’ve barely listened to them

ALL OF THEM! X-D

Seriously, though, try Lateralus or Aenima. Aenima is my personal favorite, but it marks a change over from a metal aesthetic to a more prog-rock aesthetic, so it's probably not as analogous to Pink Floyd. Lateralus is likely the album most fans would point to as their favorite and is very much a "musical experience" - very much along the same lines as Pink Floyd.