SSX Blur is a great game. I would recommend getting it. The controls are great once you get past the learning curve. There are 3 peaks. Peak 1 is fairly easy. Peak 2 is a bit more challenging but can be tackled once you get your controls mastered. Peak 3 is a beast. All of the peaks have a ton of challenges and collectibles that should keep you busy.
I'm in a similar boat in terms of time constraints (work, 2 kids under 3 1/2). With SSX blur you can pick it up and go once you have the controls down. I think it would be a good choice.
I'm playing Super Paper Mario right now and I know it doesn't fit what you are looking for but it's a great game and I've never really been into the RPGs. There are enough save opportunities that it's fairly easy to pick up and play when you get a chance.
Also Big Brain Academy is coming out June 11th. I love the DS version its a great non-platforming pick up and play.