Ease of use is relative, the more features it got the more complicated it gets - obviously. With that said, it's usually just a matter of ignoring the features/peripherals you're not using.

PIC16F570
PIC16F723
PIC16F753
PIC16F1503

Are a couple of the devices that comes when using the parametric search on Microchips website. There wil be 12F and 18F series PICs as well that fits the bill, I'm sure.

/Henrik.