If I'm getting PAID, I use LR4 primarily. If it's one of those jobs we all get where "Aunt Tilly" feels entitled to have photos of her doggie taken and I owe her because she once did something for my grandmother, well, I use whatever is available and simplest.
Heck, there are some very easy options which are free such as Paint.net and Picasa. The best thing about Picasa is simply that once I've done the quick "auto color" or crop options, I can upload them to a web page where she can go get them herself and I never have to deal with her again. =)
...if you can't tell, I come from a large family and they all feel entitled to my skills, experience and equipment. It's getting old. X(