We've dropped the Disney pass because of the cost and not much new at the parks, planning to get it again when Avatar opens up. We still go time to time with cast member friends main gate passes -- most recently this past Thursday (but their schedules make that incredibly difficult)
Universal we've kept around since they have some good seasonal events that are worth it by themselves (Mardi Gras, Christmas, and concerts) and have been adding new attractions like crazy.
Sea World we alternate off and on, probably on again next year.
Universal is probably the quickest to get in and out of since its so compact, so you don't spend as much time getting to/from there as the others (makes it good for quick short trips). Disney is more of a commitment to go to. (Note: Where I live I can see Dragon Challenge and Rip Ride Rocket from the backyard, and is a 3 mile walk to the bridge in front of Islands if we walk the hotel paths, which are nice on their own.) I'm planning to go sometime this weekend to ride Twister before it closes tomorrow afternoon, which in and out quick helps!
We still don't go all the time, but we do drop in for events and probably every 3 weeks or so. When we had passes Disney we did much less frequently since it took more time to get in and out of.
The neatest thing is you learn how to gauge when to go and when not to by traffic in the area. Disney Springs is still a no go zone. We live in the Doctor Phillips area of town, 5 minutes from Universal about 10 minutes from Sea World and 20 minutes to Disney. We can see the fireworks at Universal and hear the Magic Kingdom fireworks (if we are outside)