I found one aspect of editing that I found hideous--like really hideous. Indexes. Ew. I love pretty much every facet of editing: I love the commas, the vague pronoun challenge, the small caps, the ins and outs of the possessive; but I hate indexes. It's the most tedious thing ever, and I loathe it. Half of our last test was editing an index, and I marked so many things and caught so many mistakes, and yet, I still miss enough to give me a high C for a grade.
It really is hideous.