Yeah, @Rhee hit all the points I wanted to. When one defines "feeler" as "someone who feels," most of us are going to look like feelers, at least some of the time. Remember that MBTI is a watered-down shorthand of Jungian cognitive function theory, so MBTI's descriptor concept, the T/F dichotomies, are not in practice quite what Isabel Briggs-Myers wanted to claim they are in theory in Gifts Differing.
Our feeling function is introverted, and Jung's classical model describes it as subconscious, though other descriptions suggest that in some, both the auxiliary and tertiary functions may have parity. In an ISTJ, it is more natural for us to make our decisions using extraverted thinking, which means we're more comfortable deciding based on facts and precedent. Our introverted feeling function is values based, so we're likely to first be resistant to things that violate our understanding of factual precedent, then secondly sensitive to things that violate our personal values. Either can elicit emotional responses, I'm sure.
What I'm getting at is that you can say "feeler" and mean "conscious Fe user" and you can mean "conscious Fi user." I think these two functions can come across very differently. If an ISTJ seems feelery, they will probably look more like an awkward and still shy with emotional expression INFP than a sedate and openly warm ISFJ.
None of this really matters so much with those who we are close to. I think my girlfriend sees something of a different Stephen than the rest of the world does.