What spells did Gandalf actually cast?

[Voralphion]

Suddenly a sword flashed in its own light. Bilbo saw it go right through the Great Goblin as he stood dumbfounded in the middle of his rage. He fell dead, and the goblin soldiers fled before the sword shrieking into the darkness.

I agree with you that Gandalf did use 'magic' a number of times in his travels, but the above quote is not an example of this. The sword that flashed was Glamdring, which could produce light of its own accord, and not as a result of Gandalf's power. The goblins fled before the sword because it was a well known sword that had killed many orcs beforehand.