Ron Gilbert
So, I just want to be clear here.

I am not looking for a 2D Point & Click engine. I already have a great engine that runs on iOS/Android/Mac/PC/Linux. It will do (just about) everything I'd need to make a adventure game or any other 2D game.

Using someone else's engine would drive me crazy, I'm way too much of a control freak and am constantly making engine changes to suit my needs. I also love to program and much of the fun of making a game comes from building low-level engine code and trying to optimize work flow. I enjoy that stuff.

The genesis of my original question was just to see what is out there and what others are doing and liking.  Everyone's feedback has been super useful! Thanks much!