Hey there, I’m a Cata returnee too (though I’ve been back a while now!).
We have a Guild on Hellfire/Arathor that’s mainly in it for the company and lols, but also doing some chilled dungeons and hoping to raid sooner rather than later.
We have a thread kicking about somewhere (that we’re pretty bad at remembering to bump haha) … where is it… oh here it is!
Have a nosy through that cos it’ll either make you go ‘haha yes, I’m in’ or ‘what the heck did I just read…’ 
If it’s the former, feel free to add Mumm#2233 on btag and we’ll chat some more 