2C-E, although it
can be in a way, DOB also but that one can be as well.
LSD is often quite clinical. Less emotional than mescaline, mescaline is wonderfully sensitive, and both are much less emotional than mushrooms which can just make your emotional responses go haywire.
2C-E is in my opinion the only one that is so very neutral, detached and distant but in the end all psychedelics can precipitate very heavy emotions given the right circumstances.
On the other hand, a thing like 2C-C is definitely quite emotional but I find it reliably sensitive and positive and too easy to be any scared of. This is coming from a seasoned tripper though so don't ever forget peoples frames of reference.
After reading your OP again, I would say that while 2C-E is the most neutral it is NOT fit for easygoing situations where you dont want to worry about dark thoughts.
2C-C even more than 2C-B is ideal for that, its tripping extra light. Diet tripping. Or tripping zero if you're a guy
There are some nice tryptamines as well like some 4-AcO's but that is much more complex material even if it is calm and relaxed on the surface.