Is PVE really that fun?

I've only ever done PVP and was wondering if its worth switching to PVE? Does PVE get boring in your experience and what do you do once you reach the highest level of PVE that keeps it fun?

For example PVP you are fighting other enemies and you never know who you are up against every scenario is different but for PVE it seems like boss rotations are the same .etc so wondering how it works? No hate, honestly wanna see if I should start or not. I know it will be fun at the start but talking more end game.