ENFJs have inferior Thinking, which means like all inferior functions they have a tendency to be consumed by thinking (especially negative thinking). It's not so much an overanalysis so much as often not properly thinking things through or only thinking in black and white absolutes or all-or-nothing platitudes. This is because of the over reliance on Feeling evaluations "yea but what do I think?" gets downplayed immensely. So you often get Fe-doms who either read too much information when they get in a rut and then can't properly categorize it or process it (we've all met people who seemingly have too many ideas that don't make much sense or are incoherent) or they never read at all and rely on Feelings, or the opinions of other people to guide them. Thus the Inferior Thinking of an Extraverted Feeling type is always hot and cold. Sometimes on, sometimes way off the mark (like all inferior functions).
At its worst Inferior Thinking is described by von Franz as being akin to that of a dog, who when told "don't pee on the floor," can't discern whether or not you mean the floor of the house or all floors. That's extreme but you do meet people who seem to think in such superficial platitudes, but I think for most Extraverted Feeling types these kinds of episodes of intellectual incoherence are few and far between. In my experience, both as a Feeling preference and just from observation, it tends to evoke more as over-analysis, platitudes, off-the-wall remarks, downplay of intellectual ability (they might say "I dunno let the smart people handle that," or "I can't think about this, this is too much!"), sometimes antipathy toward Thinking types (seeing them as cold or impersonal, etc.) and so forth. Again with Inferior Thinking its not your intellectual abilities that are being questioned, but rather how you approach thinking.