Quick tip for removal of swelled hop bags from narrow-necked carboys:
Once everything has been racked off to keg/bottling bucket, tilt your carboy upside down so that the bag is resting against the neck of the carboy, and then just get up in there with some scissors and gash away at the bag. Tear it apart as best you can. Occasionally shake the carboy to re-position the bag so that you can gash away at another side of it. Eventually it'll be so torn up that you can pull it out pretty easy. This can get kind of messy, but only takes a minute or two. Afterwards I do a quick rinse of the carboy in the sink to get all of the hop bits out, then a soak in PBW solution for an hour or so.