I have seen LOTS of character in Disneyland. Granted, not as many as WDW but still ALOT. Mickey is on Main Street, and many of the characters parade around. The problem with seeing them is that they tend to be in the wide open spaces (such as Fantasyland, the hub and Frontieerland) and not in crowded areas like Tomorrowland and Adventureland. Reasons for this range from lack of "properly themed characters" (not that many adventure chacters, like Tarzan) and due to the way the costumes are, the people inside, er I mean... the charcters cannot manuever around very easily. The characters are there, but to see them you have to look for them. Often times standing in line for a ride prevents you from seeing the characters. Another thing is that the charcters are out for only a limited time. In the summer due to the desert climate of Southern California, the characters get exhausted from the heat. However, I can assure you that for the 50th (especially during the busy summer) there will be an larger than usual amount of characters to visit and greet with.