Originally Posted by robwod

The Wordpress native gallery feature is not removed from 3.5.1. We use the inline Wordpress gallery function all the time, including in 3.5.1.

You can either upload the pics through the Media area, or click to Add Media on the post screen itself. Select all of the files you want and click the upload button. After the pics are uploaded, simply click on the ones you want and select "insert gallery".

Unless you are talking about it being a different procedure to add a gallery than previous versions, the actually gallery function itself is still there.