I dunno, maybe it's just me. I haven't touched dairy in 15 years, so I wouldn't know "creamy" if it punched me in the jaw. Still, this is a festbier, not a milk stout, so my feeling is this kind of addition is out of place.
Don't get me wrong, it's your beer and you do with it what you like. This kind of addition just strikes me as a decidedly untraditional change that would not improve the beer. Then again, maybe it's an improvement for you.
Why not add a small amount of MD to the last 6 or so bottles you fill, and then you can compare. If you like the unadulterated stuff better, no biggie as you just changed that one 6 pack. If you do like it better, well, now you know for next time you brew this recipe.