If you park near the tram stop, you should be fine. If however you find yourself parked at the very end away from the tram, circle around again and ask the 'parker' if you can be near the stop. Most of them are very understanding and will direct you to a place by the tram stop. I have done this on a few occaissions when I was alone. I agree that WDW is a very safe place, and I have travelled all over the world alone, but sometimes walking down that very long row of cars alone at nights gives me the shivers.
Asking for security sometimes works, but other times you may wait what feels like a long while alone at the tram stop for someone to arrive. (security may be dealing with something else at the moment)
Once I got off to walk, and the tram attendant actually ran after me and offered to walk with me as he went on his break.