That might be true for VFR, but I found it necessary to attend a couple of seminars, take an online course, and fill in some gaps with Trescott's book in order to become sufficiently competent on the G1000 for IFR.If you have solid knowledge and experience using other semi-modern IFR navigators the G1000 isn't that much different. There isn't much that you shouldn't be able to figure out after a couple of "flights" that are spent looking at and trying different features. Sitting down with an instructor might help, but only if they have the knowledge to speed up the process that you can do on your own.
I agree that it's necessary for an instructor to know the equipment well.