You can still catch junk instead of fish at skill level 600. The amount depends on the level of the area you are in. You will catch less junk with basic level 600 skill in Jade Forrest then you will in Dread Wastes for instance.
ye, fishing must be one of the most boring proffesions, only use ive seen sofar is making some gold for cooking mats ... they should make u fish up some epics boe items to bring back the fun in fishing
You cna fish up moounts and stuff. It certainly could be more interesting, but making gold isnt a bad thing. It is boring, but soemtimes it am be ok if you feel in the mood.