Back when I was using CyanogenMod on my Galaxy S3 and when Google didn't have a decent Gallery alternative, QuickPic was my go-to replacement photo browser. It was fast at combing through thousands of images and had a clean and clear interface that made it easy to get to the photos you wanted to view. Even though I personally have less reasons to use QuickPic now, many users are still hooked on its lightness, speed, and simplicity.
Each smartphone comes with a gallery app, but considering how diverse the Android smartphone landscape is, the one you end up with varies from device to device. If you want an identical experience across devices, the best approach may be to turn to a third-party app, and while you're at it, you might as well choose one that's spiffy and straightforward. QuickPic is one of our top picks in this area, and now the app's developer has opened up a beta community for testers and dropped a new beta release for them to get their hands on.
My favorite gallery replacement app QuickPic, which is notorious for its speed and simplicity, just got updated with a brand new spiffy UI based on the new Android design guidelines that were published at the time of the Ice Cream Sandwich release.
The new UI in v2.0 is now much cleaner and more fluid, with action buttons at the top right and context buttons showing up dynamically on the bottom when they're needed.