It does bring something, but the more potent the GPU cooler "Raijing Morpheus", the leap is not as huge as with less potent coolers.
The advantage of the Morpheus is that the cooler is nickel-plated. With copper base plates, it can happen that the liquid metal "sucks in" and you have to touch it up (months/years).

Don't forget that there are electronic parts around the GPU that will short-circuit if they come into contact with the liquid metal paste. It is best to strip the insulation. With CPU already seen with nail polish, but with GPU you should better google to be sure.

So to sum up, yes, it helps a lot. "Weaker" coolers have a stronger jump.