I freely admit I'm more likely to close vote just because other people already have. And since I'm being honest, I'll also say that I'm somewhat irked by being told this is a bad habit, and that it's therefore my fault if for any reason I give less than my highest level of attention to every VTC.
Since I don't evaluate every question on English Language and Usage, but I do regularly go through the review queue, it stands to reason that I see more questions where others have already VTC'd. And the site search facility is particularly bad on ELU (because it ignore many words which are irrelevant "noise" on other sites, but highly significant on ELU), so checking for dups (more importantly, identifying the most appropriate one) can get quite tedious.
If I see that other people have already identified an earlier dup, it's ridiculous to suppose I'll always double-check as carefully as I might otherwise have done. Especially if four other people have identified the same dup, and the two question titles strongly suggests they cover the same ground.
That's my first gripe. My second, which I find far more bothersome, is that as things stand, I feel my new superpower is effectively unpredictable. I don't actually know which particular tags I'm currently eligible to "instaclose", and I really don't see why I should be expected to go and check my context-specific status regularly to keep tabs on this.
As an aside, I'll just point out that I don't think tags work very well on ELU. Things may vary by site, but on ELU few if any users know or care about distinguishing between idioms, expressions, and phrases, for example (for all of which I have silver badges which could "go for gold" at any time).
The idea that not knowing the effect of my VTC will encourage me to exercise it more carefully seems to me misguided, puerile, schoolmarmish, and dismissive. The system obviously knows (or will find as soon as I do VTC), so I see no possible justification for it not telling me what my relevant status is.