I have to have my espresso every day also. No Nescafe garbage! On our November trip I found several espresso CARTS with real beans, fresh ground, etc. - the real deal. Espresso, lattes, cappucinos.
Keep in mind you can also have these drinks made and poured over ice if you think it's too hot out.
AK park - there was an espresso cart out front before you reach the ticket booths. It was off to the right side after you exit the trams.
MGM park - we always go to Starring Rolls Bakery right next to The Brown Derby restaurant. However, there is also one of the carts right across from the ToT exit/gift shop.
EPCOT park - There were at least two carts here. In Future World, after going through the breezeway and Mission Space pavilion is directly in front of you, look toward your left and there is a cart. There is also another one in World Showcase right past Canada and near the old "Millenium Village" entrance. Of course, there is also Fountainview Cafe, right by the fountain in FW.
MK park - forget it! There isn't a single decent coffee in this park AT ALL! What a shame.
Typhoon Lagoon water park - there was a cart when you pass the towel rental stand and walk over the bridge toward the wave pool, head a bit toward your right. It is right there.
Keep an eye open for those carts, people, and use them! Maybe we can get the message across to WDW that REAL coffee/espresso drinkers are growing in number.