Why can't you reheat pasta in a microwave, grill, or wok?
If you're going to reheat pasta, microwaving is a good way. Adding a few drops of water and covering helps the texture if it doesn't have sauce already on it. 

You can actually do something close to a stir fry - heat some oil and use it to cook tasty ingredients (onions, garlic, herbs, spices) and then stir in the pasta (and things like olives or sweetcorn that might want heating but don't need cooking) over a gentle heat until hot enough to serve.

Grilling is less good, but still not impossible for some dishes. For bare pasta it will dry out it, but immerse in sauce and top with cheese and you can get something nice. Strictly speaking the grill doesn't do the reheating, the (hot) sauce does - a grill would burn the top before the bottom is hot.