My must have lotion is Vaseline intensive rescue. It used to be called something else, but basically it's their fragrance free lotion. I wear it year round now because I have dry skin.
Like you, I've noticed the difference it can have on the sillage and lasting power of my fragrance of the day. In fact, sometimes for work, if I have a craving for one of my strong sillage-monster perfumes, I will spray it on skin that is not lotioned (like my tummy) to decrease the strength and make it more subtle. It works like a charm!