There's more to spiritual gifts than just 'miracles'. Wisdom, knowledge, faith, healing, prophecy, discernment, tongues, intepretation, teaching, even administration! are all gifts and to find a church with not one of them would be pretty impressive (I mean, have you ever seen a chuch with no teaching or admin?
) I've been to some very conservative churches, and while you might not see gifts in action in public, they very much were behind the scenes. That does not make them any less valid just because they're not as visible.