Command + l (small L) works for me about 80% of the time now. In the beginning it did not work at all. I have a fairly large library, so perhaps there was an indexing issue...?
The more I use 11, the less I hate it. I miss cover flow but I can live without it. I still think they've made a mess of album art. I'm kind of OCD about it and I try to make it perfect when I'm importing CDs. It's still doable, but there's no way to see cover art in list view, which is stupid. I've gone to using artists view, which uses a lot of real estate when you have a lot of singles. No more than cover flow, I suppose, but not as attractive. Plus I still can't keep the iCloud column off the list view. It reappears a few seconds after I've unclicked it in view options.
But once I unchecked the "search entire library" I think 11 is a little faster than the last few versions, which I'm very happy with. I also likene iTunes to MS Word in that it has become the bloated junk drawer in the kitchen. It's nice to see it go a little faster.