The gallery here is a bit dated and not really convenient.
In regards to not being able to do multiple uploads with one click. You have to upload each image individually and then put each one into an album.
So what's the image hoster is the less hassle nowadays? No popups, no extra registering stuff, no bollocks I suppose you could say.
Just go their site, click upload, upload multiple images with one click, done.
Thanks very much.