One way to become more productive when using Google Calendar is to use keyboard Shortcuts. Can be a real time saver if you can get into the habit.
You can view an up to date list of the current shortcut by visting this Google Link
To get into the habit I created the following cheat sheet you can print out cut up and attach to your monitor. While there aren't to many to remember it's nice to have a printed out version that's easy to reference and remind you!
Want to send appointment reminders from google calendar? Check out Appointment Reminder.