Having been playing Star Wars: The Old Republic since it launched back in 2011, I find it quite fascinating to look back at how my playstyles have changed over the years. What I used to do but no longer do, things I wouldn't have dreamed of doing at one point but now will willingly do nowadays, that sort of thing.
For example, I started on the endgame scene with a Scoundrel healer, then a Vanguard tank, and finally a Commando DPS. I remember typing in Guild Chat one day (while en-route to kill Needles as the aforementioned Vanguard) something about how DPS at endgame seemed like it would be boring, but at least as a Tank or a Healer you would actually have something meaningful to do.
I now have a cast of purely-DPS characters, so make of that what you will.
As for what I wouldn't have dreamed of doing (okay, maybe pushing it there) when I started out but now do on pretty much every character involves questing. Like most people, I'd imagine, once I'd finally worked out how to level 'properly' (let's not talk about my very first character, a Commando) I would completely stop doing quests beyond my class stories once I'd out-levelled them. Exploration was entirely incidental and was rarely ever deliberate.
I forget exactly what caused this particular switch to flip in my brain, but at some point I decided to completely reverse this decision. Map-exploration became a lot more deliberate, to the point where the majority of my characters have every single planet fully-uncovered with as many lore objects as possible discovered. Quests, regardless of how out-levelled they were, were all completed - bonus points as I would eventually find myself taking three of my max-level characters back to various planets throughout 3.0 and 4.0 and picking up where I left them off at.
Of course, as with everything, there has to be at least one outlier.