Regarding the "make it feel better" thing. It is very common for people to put a heating pad an a "bad back" for example. This introduces a chronic level of inflammation. Not good. If you understand the mechanisms of tissue turnover the the associated immune response this starts making more sense.
A legit post accute cryotherapy treatment is excrutiating. It hurts worse than the injury. This is not throwing a bag of frozen peas on the bo-bo and having a martini. I can tell that a few patients wanted to punch the crap out of me while icing. Its NOT fun.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."