Another option is to mash, collect runnings and heat to say 190 - 200 degrees to pasteurize the wort, then lid the kettle and come back to it the following day.
Yep, this is exactly what I do - I may have even gotten the idea from you in the first place! (Btw, thanks again for the bag. Been using it since May and it's still going strong.)
As far as overnight mashing feeling longer, I can't say that it does, personally. I used to be pretty wiped at the end of a six hour brew day. Now each part feels like a piece of cake.
With a 21 month old, it's all about reducing my brewing "footprint" while she's awake. SWMBO works from home, so she has her all week. With overnight brewing, my little toddler is only awake for the last two hours of it, and SWMBO generally takes her to the Y at that point.
It's not for everyone, but it works for me.