As an update to my previous rant about Maven, I updated to the dev version of the Eclipse Maven2 plug-in and noted a nifty feature I hadn't noticed before (it may have been there):
I can't remember the exact name of the option, but it was something along the lines of "Dear Maven, please stop f*cking up my dependencies and just keep to the stuff you're good at".
Sorted. My project now appears and functions like any other Eclipse project, but I can run the Maven Jetty target, etc. from the Eclipse External tools menu.
So now, I can say that Maven, in fact, rocks, and my previous post is null and void.