How high is the water pressure? It can put a lot of strain on not only the toilet fill valves, but the washing machine and possibly dish washer hose along with that to the icemaker. You really might want to consider a pressure reduction valve if it is high.
There might be a little crud built up on the seal. It's quick and easy to take apart the valve. You may want to pick up a replacement seal (assuming it is a Korky valve) at a plumbing supply or Lowes ($2-3). Replacing it may solve the noise issue if it isn't some dirt. The real long-term fix may be a PRV and expansion tank.