I use Photoshop Elements, but I wouldn't necessarily call it simple and easy to use. It has some guided edits that are pretty easy, but it's very versatile and lets you do some neat stuff. Here's an unretouched old, neglected family photo I scanned.

And here it is after being retouched in Photoshop Elements.

As you can see, I was able to remove the yellowing, the tape residue, fix the tear, adjust the contrast, remove the silver spotting, and more. It's a pretty powerful piece of software. The original photo was about 60+ years old. In the retouched digital form it'll last forever.
If you don't mind spending some time learning all the ins and outs of the software, Photoshop Elements is kind of hard to beat. It's often on sale for $69.99 or even as low as $49.99. I wouldn't buy it at the "normal" retail of $99.99 as it's on sale on a regular basis at a good discount.
Fly!!! Eagles!!! Fly!!!