I've only been back into OSRS fully for the last 4 months, so it's taking up all of my gaming time while I reach some of my high priority goals. Once the honeymoon phase is over and I'm able to play some other games, I'll likely play the following at least once a week:
Star Citizen - @Huskington would hate this game...futuristic Sci Fi. It's early in development, but I still get a lot of enjoyment out of the current state and I watch the on-going development closely.
Overwatch - I'll put several hours into this game every season, has a short shelf life, though. Don't think I need to describe this one.
Insurgency Sandstorm (steam link) - Realistic FPS. Very intense, very enjoyable.
FFXIV - RPG made by Square Enix. Raid mechanics can be really cool and you have to be very thoughtful with your skill rotation in lieu of a 2.5 second GCD.
Some other games I'll dabble in randomly, but not as consistently as the games above:
Total War Series - Turn based strategy with real-time components and resource management.
Tom Clancy's Rainbow Six Siege - Tactical FPS with a eclectic mix of 'operators' you can play as.
Battlefield Series - FPS, more arcade style than I typically play, but enjoyable nonetheless (except the latest installment - it sucks).
Borderlands Series - Looter/shooter, we all know Borderlands.
Apex Legends - Battle royale that is team based & FPS.
In the past, I've enjoyed big name games like Runescape, WoW, LoL, CS, Diablo, etc...I no longer play these now (except OSRS obv). However, I'll sure as hell jump on Diablo 4 when/if it releases. @Huskington The only game in my repertoire I think you may enjoy is Total War, check it out!