I haven't changed too much in the philosophy of what games I like and enjoy, but I have changed the specific games. E.g. I used to enjoy games TBSs like Civ and RTSs like C&C and AoE as a teenager, but now I prefer RPGs. I found that the thing I liked about Civ and RTSes was min-maxing, cheese strats, or troll strats (e.g. using a massive corps of engineers to take over enemy buildings in Red Alert). When I was in uni, though, I played WoW hardcore, which frankly fulfilled all of the requirements of a good game for me. So that was literally the only game I played for a long time, and the game that got me in to MMOs and RPGs. I've played a number of different MMOs, but only WoW and Star Trek Online have I played seriously. Dota was the game that I settled on as the confluence of my interest in strategy games and RPGs, and I played that a lot too.
On a parallel course was that I really liked FPSs, first games like Half Life, Quake 3, UT, but then more strategic, slower games like Team Fortress, Wolfenstein ET and CounterStrike. I didn't play any of these games in uni (WoW took up my whole free time basically), but after uni I started playing them again. I played on console, bought CoD games, that sort of thing.
Now, though, I pretty much only play Overwatch. Again, this has the RPG/MOBA/strategic elements of WoW, Dota etc, but in an FPS setting. Obviously other games have done this, but not to my satisfaction. Overwatch is the perfect combination of the elements of computer games that I enjoy. I'm sure I'll get bored of it one day, but I can easily see me playing this exclusively for the next 2 or 3 years.
The only major change is that I prefer console to PC now... Even for Overwatch. I just like playing on a TV, on my sofa, rather than at a desk. I can put my feet up and stuff. For this reason, I've not bought a PC game since Cities: Skylines.