I would only carry a tool if I was in the backcountry. Every resort has benches. I bet there are over 30 tool benches between Breck and Keystone alone.
+1. Yup, most resorts have tool benches, so I stopped carrying mine. I use a Dakine t-shaped screw driver that I carry on my trips to the slopes. Use it in the evenings if I need to adjust binding and stuff.