I tend to use UCGO mainly as a transport, as in I pull a couple UMMU's out of a Prelude base, load them into an SUV, and then transport them to the DGIV or XR2 that I'll be using. I went as far as to plan out special routes, so that once the crew were dropped off I could automate the SUV and it would return to the Prelude. (By the way, is dansteph going to update the Prelude Base? It was one of my favorite vessels, and it couldn't even move.) I also liked using the UCGO ISS, and moving people and supplies between Earth and the ISS.
Outside of that, no I don't use UCGO all that much. I don't use the DGIV anymore because you cannot do manual re-entry in it, which to me kind of defeats the purpose of the craft as I do all of my re-entries manually. (I've tried the RCS+Elevon re-entry method that has been suggested, but it only works some of the time.) For some people the lack of manual re-entry isn't a problem, but these days I prefer to use the XR1 and the XR2 because they are more complicated. (And the XR1 has a VC, to boot!)
For me, I've never been in to the more finite tasks of UCGO, like manually using the forklift to offload cargo or routing a whole convoy of cargo trucks to pick up the 20 tons of cargo I just XR5-lifted into the area. Too time consuming.