Matt holliday worries?

Its April 29 and he has 0 home runs. He has hit 34, 36, and 25 hr (in a somewhat shortened 2008 season) over the last 3 years. That can't ALL be a product of playing home games at Coors Field, can it? Andres Galarraga was still effective on other teams before and after his stay in Denver. And Holliday still played half his games not at Coors Field over the past few years. Time to worry or is just a case of April?