I prefer TotalFinder as well, along with Divvy with a shortcut to quickly resize. I hit Command-T to create a new tab, then Command-G to connect them together.

I prefer TotalFinder as well, along with Divvy with a shortcut to quickly resize. I hit Command-T to create a new tab, then Command-G to connect them together. It's now just muscle memory for me, I don't even think about it.