I'm fed up with people complaining about the new interface. After hearing some strong opinions about Wildfire, then using it myself, I've found it to be better than expected. There are loads of small changes that improve Pro/E for frequent users.
I would say the good points far outweigh the bad...
I've been using Wildfire for a couple of months now, and I have found it excellent to use. The most important thing i have found that is useful for the upgraded user is the menu mapper. The menu mapper shows an old ProE screenshot. You then go through the old sequence of commands for what you want to achieve, then the menu mapper tells you what and where to find the correct command in Wildfire. Try it it's VERY handy.
Wildfire is new, so give it a chance. You'll get used to the interface. It took me about a week to get used to it, that was using the menu mapper though.