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GM supplies 12 volts to the drivers side switch. Then comes off the drivers side switch to the passengers switch. So what happens is, when you roll both windows up or down at the same time you are splitting the voltage. Now you have 6 volts trying to run a 10-12 volt motor thus burning them up prematurely. Combined with the heavier windows that spells disaster. So, replace your motor and then try and remember to roll the windows up 1 at a time and this will extend the life of the motor tremendously. You see the same thing with any 2 door GM car. i.e. Grand Prix, Monte Carlo etc. Believe me with both switches there together, it is hard to refrain from doing both at once.
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