Yeah, its an odd one. I've definitely lost interest in single player, story-driven games, as I feel like these games can take a while to yield satisfaction, or atleast a while to get to the point. I don't really have many gaming binge sessions any more. I used to play games for hours upon hours, sometimes all day, or even stretching to overnighters where i'd have mega 10+ hour gaming sessions.
For the last 5 or 6 years, as others have said, i've preferred spending time productively, working on things. Whether that be project work, or even just university/school work. Interestingly however, i've finished my studies now, which has freed up a good 8+ hours a day. Spending a year now working on projects and just seeing how things go. Although so far, I have noticed that i've been spending a lot of my free time away from the computer now. I've been cycling alot, which is odd as I do love playing games, and could easily slip back into that routine.
As far as the games I still play, I tend to play either sandbox games which I can plug a few hours at in a go, or mostly, I tend to play multiplayer games where each session is limited to a small number of matches. I find that this allows me to play an hour or so of games a day, without it consuming my life in the way it did when I was younger.
As far as how game development has changed my perception on games, i'd say that I do appreciate them more, however being quite savvy with computer graphics programming, I constantly notice small little tricks and cheats that developers use to either create the illusion of better graphics, or mistakes as a result of a limited implementation of something. One really noticeable example is that the SSAO (Screen space ambient occlusion) in Black Ops 3 doesn't have any filtering, you can still see the pixelated noise pattern used
! It's both fun and annoying as it does sometimes break my immersion, though at the same time, I do love reasoning about how developers might have achieved a specific feat
I do tend to find that I get tired of single player games these days. I bought watchdogs, and whilst that game was good in theory, I just couldn't get into it. Similarly, I loved the first few hours I played of GTA 5. Thought it was a really fantastic game, however life got in the way and I had to put it on hold. I still have yet to get back to it :L