Guys, do yourselves a favor and buy the Ice Surrender tool mentioned (by the inventor/seller) in one of the comments above. I'm not affiliated with him, but it just works -- it's the right tool for the job. IMHO, it's well worth the (small amount of) money to have a solution that fixes the problem with literally only seconds of effort. It's infinitely easier than most of the solutions described here. Heat water, suck it into the syringe/tube assembly, stick the tube up the dispenser tube till it stops, and then push out the hot water, pushing the tube further in as the ice blockage melts. In a few seconds, you'll have melted the whole thing.
Using a blow dryer was useless for me, though granted, I wasn't willing to spend 10 or 15 minutes or more doing it, as some here seem to describe.
On the recommendation of a GE tech, I had previously tried turning the freezer up from 0 to 5 degrees. Just got too soft ice cream, water line didn't stop freezing on me.
Now the temp is back down, ice cream is good, and the dispenser runs fine. When it freezes again, I know I'll be able to clear it very quickly, with the tool.