I thought it was hilarious, hahaha. When Mickey Mouse came on and started speaking I nearly lost it. Just the tone of his voice and the absurdity of what he was saying was fantastic. Overall for me personally I loved the episode.
I thought that was one of the worst south park episodes I've seen in a while. I think the only time I laughed was at the very beginning when butters was walking down the hall and cartman was fucking with him. It may have been a little trippy or whatever, but in terms of laughs I thought it was very weak.