I love training in any fashion possible, so let me add my two cents...
I took the tradional EMT-B and I programs. Then for continuing ed hours I have done the Wilderness First Responder and SOLO's Wilderness EMT add on module (for those who are already EMT's). I had a blast- even though the EMT module was in January- mostly outdoor-in the cold, the wet, the muddy... LOL it was a blast! I work both ambulance and as an on-site medic in heavy manufacturing plant where I spend my nights filled with amputations, avulsions, impalements and 2-3* burns. Wilderness training gave me a whole new set of tools and ways to think outside the traditional box to care for my patients. A fully stocked ambulance is one thing, my on-site job requires a lot of creativity under stress to really help the patient. I may be with them without (trained or transport)help for up to 20 minutes which in EMS can be a lifetime to someone injured.
Bottom line in my mind- take all the training you can get- it will never hurt and it can be tons of fun! Wilderness Medical Institute, SOLO, Your local Ski Patrol are all great places to find more training. I also do lots of online CE classes just to keep up with terminology and trends.