I didn't join until somewhere between IOs and the Real Numbers update, but a surprising amount of how I play is still the same!
The big difference is in what sorta missions I go for- back in the day I was ravenously eating up radio missions any day of the week. If someone broadcast a radio/newspaper/whatever mission team, I was there.
Those are quite a lot more rare now, and I'm finding myself playing storylines solo instead! It's been fun bouncing between them and pointing at the screen going "oh this one must have been from the Going Rogue era! Oh this one is ancient! Oh this one has tech they added around when Villains were added!"
I suppose I also favor different archetypes now. I used to avoid Stalkers (just couldn't get into them) and Corruptors (I didn't want to play a 'worse defender'). Now I find both of em delightful, but I play less Tankers and basically zero Brutes. Hell, Corruptor might be my most-common AT on homecoming!
Soooo many other things are the same as they always were. I still hop around like a ninny any time I'm not actively doing something else. I still try to cheekily grab a pack of enemies when the whole team's not there yet. I still love combat jumping and superspeed. I still do barely any task forces. I still can't get into Controllers. I still write every character like an elaborate joke. And I still love this darn game.