Yes! So glad to see that extrude with keyboard still works. I don't use Photoshop that much (more of an Illustrator user), so I'm not sure if Alt is more or less intuitive to Photoshop users. Just glad to see that it's still there. Probably no need to change it for Mac users, but it would be nice if it were on a list of keyboard shortcuts (maybe it is and I haven't found it yet?).
Unchecking the mask box was the issue with using the Pencil tool. It's cool that feature is there. I definitely see why this would be helpful, but didn't get that was my issue at first glance.
I'll have to keep messing around with the Extrude with the mouse tool. I still get mixed results when I'm working with an object with a depth of 1. Thanks for clarifying that it's a two-click tool though.