I do! I need some argumentation like in Deus ExWhenever it's possible. I love it. @linuxares sounds like you need a New eye XL.
Well I'm almost 50 years old and still play with it. To each they own I think. Some like, most hate.I barely could see an elephant in front of me because of lazy eye, therefore no chance for any 3D relief. That's for young kids with good eyesight.
On most games, no. There for sure were a few games that made excelent use of the 3D and are honestly a better experience with it, but that library is rather small.I find it's nice to have but think most games aren't losing much if you turn it off.
Sadly no. My right eye have issues with it on both old and new 3ds.