My mums family have never put alcohol in their trifles, usually they just layer jelly, sponge cake, some canned fruits and custard. They don't have a specific recipe, just toss whatever 'trifle-ish' ingredients they have handy in the bowl. I've always loved the taste of their trifles.
My husbands family puts sherry in their trifles and quite frankly all you can taste is the alcohol, apparently it's not a 'real' trifle without the alcohol
Funnily enough, by the end of the event it's usually got less than a quarter eaten and generally that's only by the diehard trifle fans.