Yup! Its helps a lot in searching. When google toolbar is in your browser than you should not need to go for google.com. You can search direct from google toolbar's search option.
there are some great add ons these days, especially for firefox and chrome. no need for the google toolbar.. all i have is the google search box. all other add ons are pretty cool seo related add ons
Google toolbar has pretty much been superseded these days as most if not all modern browsers have a search field as well as a popup blocker and spellcheck built in.