If you're a facilitator, you're someone who helps other people get things done. I don't think we can finish this without a facilitator to guide us through the final phase.
Many Romance languages have a word descended from the Latin facile, "easy." If you're familiar with any of those, then facilitator will be easy for you to remember. All sorts of people need someone to who makes a process easier. During a negotiation, for example, the parties may call in a facilitator to help iron out their differences. If you've got a friend who can't seem to get their physics homework done, you can be a facilitator just by holding their hand through the toughest problem sets.