Prop 13 did and continues to do a lot of favors. California also is not struggling with crumbling roads and infrastructure and many years ago began adding multiple bike lanes and amenities including paths for miles along the coastal areas as well. Their schools & Ed are great, their cities are well kept. Property values do get assessed 2% higher per year, but not in the double digit increases we are seeing in Colorado.

Unless someone spends a lot of time there, going to Disneyland or the beach for a couple of weeks won't make that so readily apparent, especially if comparing Colorado to California. 

Stability in tenent and in homeowners too is cost effective, as is companies will going to relocate knowing their employees will purchase homes. Tenents stay longer because landlords are not forced to raise rents to cover property tax lurches-(like we see here.)

With that said, the liberals of course want to get rid of Prop 13, they see that as a immense cash cow, ripe for the picking.