Yeah. Heck, you can just prop the slide rule up somewhere and look at it without even moving the slider. No button punching required.
It's not at all more work... I agree with the OP, this is a guy who really wants to use his slide rule and is pushing it over other (better) solutions.
This is indeed the point. Even with messy hands you can just look at the slide rule and read off the right amounts. No need to touch the calculating device.