All Alamo locations have an express check-in kiosk named "Q-U-I-C-K-S-I-L-V-E-R" where you swipe your membership card and head straight to your car -- back when I was a frequent flyer, I used to use it quite frequently and it worked very well for me.
I would share the link, but DIS censors don't exactly approve of the naming of Alamo's kiosk (you can use your favorite search engine and get there, fairly easily).
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