I have limited experience actually SMing, but I've directed and opped and been around a lot of shows. When I SMed, our booth was not only not soundproof, but it was basically a megaphone into the theatre, so we had to be careful of verbal cues. When I was SM, I have very good responsible technicians, and they did do crossword puzzles, etc, which concerned me, but I always had them confirm a standby even with a nod or eye contact. I don't think it has anything to do with a power trip. If you're SM, the responsibility is totally yours and it's on your behind if a cue is incorrect, so you have every right to have a conformation on a standby. I had a time or two when I was distracted and didn't look for the confirmation because I was dealing with another tech (we had a crazy show with turntables that had to be manually turned and different crews every night. It was so hectic), and on those two occasions my sound tech was late with the cue because she hadn't set it up on time.
I explained after the first tech that I wasn't asking for confirmation because I felt they were stupid or because I was on a power trip but because I just have to be sure and it's a system of checks and balances. It worked out well for me, but that wasn't in the real world, it was in the happy college world, where the cast and crew were told at the first tech "Jenn is your stage manager. From now on she is the Queen. Whatever she tells you to do, even if it;s to stand on your head, you do it without question"