Adobe products are always very complicated and confusing.
I'd say that Fireworks is a far more user-friendly and easy to comprehend version of Photoshop, but then again, Fireworks used to be a Macromedia product, and Adobe eventually bought out Macromedia... Fireworks today still looks and works exactly the same now as it did back when it was a Marcomedia product, it's what I use for all my graphic design and image editing.
Pinnacle is a professional editing software. I mean, its not like cinema quality, but its meant for people who are serious about movie editing but don't have the funds for some more expensive software. Pinnacle's interface might be like movie maker, but it is much more advanced with a truckload of more features.
I ought to look into it then, I've pretty much gotten to know the ins and outs of Movie Maker, but even its most recent versions (which I don't particularly care for, which is why I downloaded the Vista version for my computer in conjunction with the 7 version) have a lot of limitations. My biggest beef with Movie Maker is you only get one audio track to work with, so I often times find myself doing a LOT of mixing otherwise like in Audacity or keep publishing test files of the project to add additional audio to it before I add THAT file to the audio track, then publish the actual file itself.
I haven't used iMovie in a long time, but I know the editing equipment down at the television studios use it as one of their editing programs, so I may need to familiarize myself with it again; one of my buddies keeps recommending it to me, because it uses it a lot to re-edit old Pink Panther cartoons that have had the laugh track removed, so he can re-add the laughs to them, and laugh tracks usually have mulitple layers of audio to make the audience reactions sounds more natural and realistic... just listen to some of those Steve D'Monster episodes from Season Five and Six, then compare them to Season Seven, you can hear quite a difference.