I was an ED tech at a major trauma center for three years. You'll get a lot of invaluable experience seeing what happens to patients *after* EMS has dropped them off and left the building. When you do go on to a service down the road, you will have an edge to knowing what that patient really needs versus just running through the protocols. Also, if you befriend the ED physicians and RNs because you've shown that you can work hard, care about the patient, and want to learn, you will also pick up invaluable gems of knowledge that will help immensely down the road. Although I was as busy as a one-legged dog with fleas working as a tech, I would never trade that experience for anything.
My opinion may be a bit contrary to others, but for the sake of the nurses and patients in your area, don't always be the first trauma monkey. I've worked with techs who felt their only purpose in life there was to pick their butts off the chair only when EMS arrived with a critical patient. Anything else was below them, because by God, they are a certified EMT-B, I, or P. Bedpans are for nurses (in their opinion).
That left me with the bedpans, the stocking of equipment, the crash cart inventory, the call lights, the transports of the patients upstairs, the blood draws, the ECGs, the bed cleaning (our housekeeping staff left much to be desired), and on and on... you get the point. Well, the nurses notice. The docs notice. Even the DON noticed.
When it came time for layoffs, I had a job. When I wanted to learn more about the patient's condition, the physician would sit with me for far longer than he should to explain it --- and he was busy to begin with! The nurses would stand up for me, and were a blessing when I finally applied to the 9-1-1 service. For the others, they were not that lucky. You reap what you sow.
Just remember as a tech, you are not one onto yourself. You are not something so special you must be revered by all who do not know the ways of the prehospital provider

h34r:. You are working with nurses and physicians to meet one end goal: help all of the patients under your care. Keep that in mind, and you'll gain experience that could never be bound in a textbook.