Zipper merging is the accurate, efficient and effective manner in which vehicles should be merging. That's pretty well a stated fact. Using all available roadway is seperate, but does go hand in hand with merging when done correctly. When traffic is free flowing I typically use the full length of a merge lane getting on the highway to get up to speed and merge. I also will use the full length when the highway is congested.
Judging by the comment, it sounds like you're the guy that merges right away and leaves the traffic to backing up horribly behind you on the on ramp while an entire length of merge lane is open ahead of you.
Actually I'm the guy who merges while traffic is moving, so that I don't screw with the ability of other drivers to keep moving, unlike so called "zipper mergers."