I change the coolant in all my vehicles, which includes my car and numerous pieces of ag. equipment at work.
Today's coolants are so improved over the old high silicate coolants of 20+ years ago that maintaining coolant is a breeze. If you keep up with your coolant and don't have engine problems (leaking gaskets), gone are the days of having to flush gunk out of the system.
On several forums I visit, many people choose to just do a radiator drain and fill more often, rather than going the full service interval and then doing a complete exchange. A radiator drain and fill changes about 1/2 of the coolant and keeps the chemistry fresh. Draining and refilling the radiator should take less than 30 minutes.
If you have a neglected system or one with other problems, then a more thorough flush is recommended.
So, somewhere between about 50% and 75% of the recommended service interval, I drain the radiator and refill it with 50/50 mix of the CORRECT fluid.
I personally believe in using what's in the radiator from the factory (OEM or correct aftermarket fluid) and not using universal fluids like Prestone. You really don't want to mix coolant chemistry. KISS....Keep It Simple, Stupid.
Both Ford and Chrysler have recently (past year or two) switched from G05 coolant to OAT coolants. Chrysler claims its OAT chemistry is different than Dexcool (no 2- EHA).
Here's a good primer on coolants,
but it is quite dated (2010) and much has changed:
http://www.motor.com/article.asp?article_ID=1655
Here's the Chrysler OAT coolant announcement:
http://www.sae.org/mags/aei/mater/11284