Well, I did it without crampons and didn't feel sketched. Similar conditions I'd guess. I was happy to have the yaktrax though, there's a couple places I crossed water ice that would have been sketch in just boots. A bit of traction on the icy sun cup steps was nice too. We took off from Cold Springs at about 4:30AM, were at the top by 9:50, back at the car at 1:45PM. It may have been do-able with just boots later on softer snow, but the trax are small and light enough, why not.
As for skiing, if you're diehard there could have been some decent afternoon turns in the lower bowls. I wouldn't bother carrying past lunch counter though, unless you like 2-3 ft sun cups.