I've never been a fan of any mind mapping apps. BUt I finally found one that I actually use a bit.
Extremely simple the app from Literature and Latte (The same folks that make Scrivener) is in Beta now. It allows multiple base nodes and has almost no bells and whistles but works. Yes, it's beta but so far I have not had any problems with it at all.
Might give it a try for simple maps.
Expected price when it is for sale is around $10 or so.
Oogie McGuire - Mac, iPhone & Omnifocus
OogieM on Twitter
Paonia, CO USA