Edited by Pint of Brew - 2/15/12 at 3:57pm
I use reno from time to time and apply it to the shoe with my bare finger. I do not find it to be greasy at all, it feels slightly oily but only slightly and dries very quickly.
Similar to you, I use Reno on new shoes because I've got no idea how long they'd been sitting there without being moisturized. Aside from that I don't use it at all. Shoe cream and wax are more than sufficient for taking care of my shoes.