Not particularly surprising, really...I imagine half the posts on the 5e forum are from the top 50 posters or so.I guess the lesson here is you can't assume how big a problem is by forum posts even within the ENWORLD site itself, let alone gamers in general. There appears to be a lot of people on this site who don't post many posts, but are still here reading and looking at things. So if 20% of ENWORLD posters feel a certain way, that doesn't mean 20% of ENWORLD users feel the same, for whatever topic it is.
Then it sounds like you are option 2. What it means by "increase their impact" is that RAW, you find them significantly lacking as a challenge for one reason or the other, so you make a focus on boosting those (like doubling HP, or maxing HP, or increasing damage, or giving abilities, or really focusing on the tactical/planning/intelligence of the monster to make them more effective in battle. That RAW just doesn't do it in most cases.
I voted 4 but the way you describe 2 above makes me want to pick it, but then I look at how 2 is described in the poll it's different. What am I not understanding?
It's really the difference between minor one offs here and there, and thinking the way the monsters were designed is fundamentally weak as a whole. So the difference between 1 and 4 (both choices that place focus on the statblock and not the flavor text or environment) is that #1 is where you'd rarely feel the need to boost up the stats for the monsters, and #4 you find yourself frequently if not almost always feeling like you need to do things like double HP, increase DPR, give extra abilities, etc.
does that help?