Ian, I refer to all the auto stuff as gimmicks in this situation. The instrument at the club actually has a bender, but it won't get used on my nights.
It's only essential where it's appropriate, and this is not one of those cases.
I will miss my harmonizer, but there is a "purist" technique that only comes out when I sing "dry", and I seem to alter my approach to fit the occasion. It's actually refreshing on the rare times I use this type of setup.