I know you said you're going to avoid being technical, but just for others that will find this, GMRS allows more power on channels 1-7 and 15-22.They use GMRS over FRS because GMRS has more power and more specific frequencies
There aren't "more specific" frequencies between FRS and GMRS. The frequencies are the frequencies.
You can use DCS or CTCSS encoding (also called "privacy codes" in bubble-pack radios), but those aren't private like a cell phone call. Anyone on the frequency/channel without encoding enabled will hear everything you say. Again, just writing this so others don't think they can pick up a GMRS radio and have private communication outside of cell phones.
BTW, a GMRS radio license allows you to operate a Part 95A radio. The Btech GMRS-V1 is Part 95A compliant and requires a GMRS license (like yours) to legally operate it.
The UV-5RTP is not Part 95A compliant and thus requires an amateur radio license to legally operate it. Your GMRS license will get you out of exactly 0 trouble should someone actually pursue that avenue.
Realistically, it's highly unlikely that you will be prosecuted given the limited resources of the FCC, unless you do something really stupid like talk to Air Traffic Control or police dispatch.