Your GPA is an indicator of your ability to be responsible and do the work that is asked of you for four years. Whether or not you think that some GPAs are worth more than others, depending on the school or program of study, GPAs are still very important. Unlinke the LSAT, the GPA measures your acheivment over four years, 35-40 courses, with hundredes of graded assigments asssed by a variety of different people. Certainly, you can game the system and get a better GPA by doing less work (avoiding profs who are reputed to be hard graders, etc.), but hell--gaming the system is a useful skill that can make you a more successful attorney.
If the GPA is from a reputable school with a rigorous course of study, then it means a whole lot more than the LSAT.
And congrats on your high GPA. You are awesome and I'm sure you're super responsible.
I've been a 4.0 student in some semesters and a 3.0 student in others, I recognize that the difference really isn't that substantial.
if you slack off your freshman year of undergrad, it doesn't mean that you'll slack off in law school.
People don't really change, but motivations change a whole lot.