That would be correct - we do not have a drag and drop interface, although its something we've been looking into. I think Gallery has the same kind of ability as well, but uses a Java app for the interface.
One nice thing you get with PhotoPost is the ability to change the interface with one switch - you can use the forum format or a "gallery" format like these two side-by-side comparisons:
We're even working on a third option giving users even more flexibility. My
ViperAlley.Com site has a pretty clean interface with some of the clutter turned off and with an configurable thumbnail preview line, you have alot of control over the look of your pages without having to modify any html code.