I confess. . .I hate double-spaced anything. It is too hard to read. On screen there is too much scrolling. On paper it takes up too many pages. I don't generally do the line by line kinds of edits on paper these days where I need the space for making editing marks and notes. So double spacing is just annoying. At least most authors have gotten the message to single space their summaries, and thankfully electronic documents let me change line spacing--even margins, font, type size, etc.--to my own liking with just a couple clicks.
Rant now over. LOL