Well, when you're a little man, then yes, the step is nice. As my bones become more brittle, the leap from the tailgate is no longer made with confidence but with more than a little trepidation. There was a time when I'd approach a chain link fence and do the one handed vault without a second thought. Now I don't even think about trying...cup or no cup.
I have no qualms with the GMC. Yours is that unfortunate compromise between interior cab space, exterior bed length and the distance from bumper to bumper.
For my purposes, anything less than an 8 foot bed is unsuitable as I have grown tired of leaning 10 sheets of drywall against the lip of the tailgate instead of sliding them into the bed and flipping the tailgate shut.
The extra cab just makes it too difficult to find a parking spot.
I just leave the tailgate down and run straps to the hooks in the bed. That keeps things from sliding out the back for those rare instances where I need 8ft [like tomorrow when I buy sheets of beaded board]. And the extended cab is really to hold tools and stuff when I travel so they aren't left in the back section to be "borrowed".
And really Girl Scouts are much better than brownies. They come with Cookies for afterwards.