Applications :: IPhoto Enough Or Something More Powerful

I'm new to Mac and just purchased my first MBP.I'm no pro photographer, not even a semi-amateur, all I do is take family shots. Over the last few years, I've accumulated over 12000 photos, mainly of the kids, all organised in folders.I hardly do any retouching, just the occasional red-eye, add brightness or darkness....basic stuff really.What I am looking for is a organiser that can handle not only the current set of photos, but as the collection grows to be able to keep up.And must be easy to use, I don't want a steep learning curve. For video editing I purposely chose iMovie over Final Cut or Premiere, as it's easy to use and serves my purpose.