I tried Feedly for a few minutes, but it felt like it was trying to prioritize and reorganize my news stories automatically for me and the design was awful for simply reading stuff. And it required simply too many clicks to read slashdot since I had to expand the whole summary for each item myself and even mark items as read manually. Not going back.
I'm giving Feedly a try starting today, and I think you probably have the same reaction I did: It's NOT EXACTLY THE SAME AS GREADER. But it's learnable, and it's customizable.
Keyboard shortcuts exist, but they're all different than GReader, and that takes some getting used to.
If you like GReader's compact title-only view, that's an option -- but you can also show everything by default, which is preferable if you have a folder of comics feeds like I do.
I think Feedly has two big points in its favor, though: it can sync ONCE to GReader to download your feeds (including what articles you've already read), and it's cross-browser and cross-platform with its own mobile apps. (Plus it's ad-supported, which means they have a revenue stream to keep them going in the future.)