Yes the Double decker (Omni) bus is still there too. As Flower4pwr stated though these vehicles are not run all day as the streets get to busy and unfortunatley if there are any call ins anywhere in Main Street attractions the vehicle drivers are the first to get pulled to cover them so while they "should" be out first thing in the mornig don't plan your whole trip around seeing them.
As for the stickers, I have not seen those is along time. I have been on MS for 3 years and can't say that I have seen those stickers in the last 2...