Personally, I would allow the extra 20 minutes in my commute to avoid going by there. Why would you want a constant reminder? And it's adding to your stress; wondering what she's doing. At least do it for now, when you're more detached go back to the old route...or not!
As far as the anger and resentment: I'm not sure you can avoid it. I would guess most people go through it- it's frustrating, insulting, embarrassing, hurtful and sad that your WAS is "giving up". I am struggling with this really badly right now, too. People keep telling me it's normal, and it'll pass as time goes on and we detach more...
Hang in there!
Me: 39 H: 45 Second marriage for both H left 12/2013 M:4 T:5.5