That's a very good point, and I'm guilty of doing that a lot.
While "Control Panel" is a different thing than cPanel, it does lead to confusion. I think the greatest part of the confusion is that DreamHost itself has called it the "Control Panel" for years.
I'm afraid if I started calling it "Web Panel" all of a sudden it would also lead to confusion, as the term "Control Panel" is used extensively in exisiting documentation (Kbase archive/wiki). In fact, DreamHost staff seem conflicted among themselves on what to call it.
I see it called "Web Panel" in the links to it on DreamHost's website pages, and the DreamHost blog has used "panel", "control panel", "account control panel, and "web control panel". The DreamHost blog onks to it as "Web Control Panel".
I think I'm going to start calling it "Web Control Panel" for now, but am happy to call it by anything at all if it will help eliminate confusion.