You do need Megapixels: Some bloggers will say more megapixels don’t matter and are more about marketing and sales gimmicks; for the most part, they are absolutely correct. If you are shooting JPGs and not doing much tweaking, you are wasting your money thinking you need a new camera with more megapixels. However, if you are shooting birds like I do, then you will be doing a ton of cropping to turn a smudge in a frame into a picture of a bird.
Click here for Solitary Pipers and some before and after heavy crops.