My daughter hates to use a sifter. We always use a food processor instead of a sifter to aerate and mix the dry ingredients for a cake recipe. We originally got this idea from Alton Brown who also hates to sift.
Note: A food processor does not work for powdered sugar for icing. You must still use a sifter for the powdered sugar used in icing so that it will not contain any lumps, especially if you are using decorating tips to decorate the cake.