Years ago...probably like 2010, we dined at the 50's Prim Time Café, where the wait staff was supposed to be sassy. After taking our order, but before our food was ready, our waiter randomly came to our table and dropped some 20 WDW pens (pick-up sticks style) right in the middle of the table saying, "Here, this is the only free thing you're ever going to get from WDW! Hold on the them!"
In the same era, WDW CM's used to give away LOTS of free Mickey Stickers. Back then, you'd find them stuck randomly all over WDW, and slowly I've seen fewer and fewer of them. One day at WoD, a CM randomly handed me almost an entire roll of Mickey stickers!
In the semi-sorta-same realm, WDW used to have other small freebies that, well, I'm not sure how to qualify them, but they used to be free and now they are just gone, or nearly gone. WDW napkins used to wish us a magical day, but now they are just plain boring brown napkins. And Transportation CM's used to give out little cards. I have heard those aren't completely gone, but I haven't seen one in years. CM's used to give them out quite often.
While the WDW birthday buttons still exists, they also aren't as prolific as they once were. there was stretch of about 4 or 5 years where WDW went birthday-special event crazy. If it was your birthday or something CM's were super enthusiastic about little things like giving out some sort of free sweet.
There were other little perks too. Like certificates for being the first customer of the day. We also once got a golden Fastpass just for answering a question a CM posed. I mean it was literally golden, and good on any ride that day. I'm not sure where it is, but it was too cool to actually use it!