i’ve been using nextgen gallery and i believe it fits your needs:
1. Upload a folder full of images : yes
2. Resize images according to a specified size : yes, on the gallery option you can set the standard size.
3. Have the ability to organize these images into folders (collection1, collection2, etc) : yes, they’re called albums and galleries. Albums contain Galleries, and each Gallery can a set of images.
4. Display the images within these folders in a non-flash gallery (collection1 on page 1, collection2 on page 2, etc) : yes use the shortcode [nggallery id="x"]
there’s also many plugins that extend it’s funcionaly, like extra slideshows and lightbox effects.
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