Speaking as float pool, I know just what you mean. Personally, I like the float pool. Its always something different and we get to work with practicallly every seevice in the hospital. I would check to see if you could ever be allowed to work with some of the cv machinery. Not being 'competent' im VADs, ECMO, CRRT, ect is sometimes the most frustrating thing for experienced ICU nurses who join the float pool, although you wouldn't really have those much in the cath lab either. I do feel like the float pool has a lot less drama than the 'real' units. I frustrates me more than I can say when other nurses talk about the float pool when they don't think we're in ear shot. I've heard "floats never help" and "we shouldn't ever let floats do..." and yes, somedays it feels like we hear "how are you keeping up with that pair, the _______ about the situation would drive me crazy!" more than we really should.
At the end of the day, I like the ICU float pool. At my facility, its a great group of people and they honestly care about getting the job done well and understanding all the aspects of why the whole ICU works the way it does.