Well, see, I happen to frequent both. I travel a whole lot as well, Tommy, but my macbook goes with me everywhere. Occasionally I will encounter a wireless network that blocks irc ports (usually 6667, which incidentally is the one #qc uses), but that is not all that often!
I really like being able to talk with a bunch of people all at once and carry on rather lively conversations with multiple participants. However, I can definitely say that I would probably not [attempt to] use Gabbly nearly so much as I do if the people in it were not (for whatever reason) so averse to using IRC, because I find that the setup and visuals in IRC programs to be more organised and visually appealing and easier to follow. I like that there are admins in IRC because they can throw out people who are being disruptive trolling dicks and fix programming issues when they arise!
Gabbly often does not load for me; I think that since the last time it was universally not loading for everyone it works 1 in 3 tries. I do not know why this is! Perhaps it is my browser that it does not like, or something. Plus I am not really sure why people keep bringing up the fact that Gabbly is a "free chat program" when IRC is also free.
We talk about things in IRC that are not nerdy sometimes! The other day I had a conversation about haircuts and hairstyles with some people in #qc, and discussed bras versus corsets in #xkcd, but neither conversation lasted very long because there were not enough interested parties to keep it going. We do not really ever talk about music because all the people who want to talk about music avoid IRC in favour of Gabbly, so I guess you just have to pick and choose which are your lesser evils.
Post-script: Tommy, as far as bands go, I find I agree with Patrick in about 50% of the Gabbly music conversations I witness. Deerhoof is really not that good. I am sorry! Maybe I just need to see them live and my opinion will be changed, but as it stands now, I cannot listen to their music without wanting to break things. And some of the music videos Khar posts are amazing and hilarious, but the music is shite! I do not know what to say beyond this.
Edit: Obsessions, do you use Windows? If so, can you use Trillian? a flash drive with the program on that? Chatzilla with Firefox? Ok problem solved.