It's just adding a lot of good vanilla to whatever you use, if what you use you like, then just add more vanilla. Really that simple.
My new favorite ingredient is Nielsen-Massey's vanilla bean paste. It adds great vanilla flavor and the specks of vanilla look so good!
add french vannila pudding..it gives it such a strong vannila flavor
The scratch yellow cake recipe I use gives a really good vanilla flavour, but it uses crisco as the base 
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The other vanilla cake I use is by doing a slight tweak to the WASC cake - instead of almond, I add triple the amount of vanilla...gives it a delicious vanilla flavour. The best part of it is that it you can dye the cake batter to match your theme 
. HTH
I made an Oreo cheese cake once which was really really vanilla-y and equally good, that would probably be no good? From memory the vanilla-ness just came from a very large quantity of extract (its all I had but is also what the recipe called for)
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