Chrome only: Sure, some of the Chrome Web Store's "apps" are just bookmarks, but they're helpful bookmarks, with big icons. Meta-extension AppJump organises Chrome apps into groups, so you can quickly launch your needed sites in whatever context you're browsing.
Installing AppJump by itself won't do much for you, unless you've set up your new Chrome tabs to show something other than Chrome's new tab page and need a quick access point (and that's maybe a great idea). When AppJump gets useful is when you head into its options and start adding apps to groups, so they can be organised from the drop-down AppJump window.
AppJump can also manage your extensions, but you can't "launch" them from the app, due to a Chrome restriction, it seems. For certain types of Chrome users, especially those with lots of "apps" installed, AppJump could be quite handy. It's a free download from the Chrome extension gallery, and it comes from the makers of similarly clever Chrome apps Incredible StartPage and TabJump.
AppJump App Launcher and Organizer [Google Chrome Extension Gallery]