I really like the trunk groups feature, and the new user-defined digitmaps. I've used all four trunk group slots, and while I don't think I'll need anymore in the foreseeable future, it's always nice to have some spare capacity. Further, I'm sure there will be people with more complicated set-ups than mine that will wish there were more trunks groups available.
Same with the user-defined digitmaps. I think these are great, these have vastly simplified my call routing configuration, and made it all much more transparent and easily maintainable -- but I've used 6 of the 10 slots already. Again, I don't think I'll personally need more in the foreseeable future, but I'm sure someone will!