Some people, including myself, do seem to find some sort of base "signature" taste that comes across kinda weird. It might just be my tastebuds and subjective experience, too, but I do find it a bit odd, myself. It's not terribly off-putting, though. I've wondered if it's just that I'm not used to vaping cupcakes or something.
Do you get the same taste with Twas Brillig and/or Berry Lil Cheesecake?
The "cake" taste is a little weird to me too. .. it just frankly doesn't make me think of cake. I detect it in all of the bakery vapes, White Rabbit and Bandersnatch. In the big AiV thread someone suggested it might be a butterscotch taste but others protested it definitely isn't butterscotch. Before I was simply identifying it as a "buttery" taste. I can't put my finger on it, but I feel like we're all identifying the same note.
I do detect it, but don't mind it in Zombie Apocalypse, White Rabbit and Twas Brillig. I think whatever other flavors they're using in those balance it out for me, or maybe its just used to a lesser degree.
It's strongest to me in Lemon Loves Cake, Cupcake City and Pun'kin Tumble.
I have not yet tried Berry Lil Cheesecake, myself.