No, you're not the only one. Some DMs have a leeeeetle bit too much time on their hands. I appreciate that he prepared the adventure and all, but if you have all week to prepare the information, and then spit 6 days worth of background notes you made at me in a four-hour session, be prepared for me to stop giving a crap. It probably seems like "fantastic background detail" or "subtle mystery clue" to them as they write it up, but to me it all starts sounding like "innumerable detail #186" after a while.
If everyone in the city is fantastically detailed, I have no way of knowing which ones are important for this overarching railroad-plot you have us on (and DMs that have this much background detail are inevitably the ones who wish they were writing a novel, and have a plot the PCs can't avoid). This may aid the verisimilitude of the world, since my character would really have no way of knowing which people were "plot-important" either. But it's guaranteed to bore the crap out of all of us as we spend the whole session sifting through the 8000 irrelevant details you tossed at us.
When I run games, I go the exact opposite. I only write down details I know ahead of time WILL be important. Mooks that may be encountered in combat don't even get names. Information-source NPCs don't get statistics at all, just a note of what they know. If the PCs end up trying to fight them, I make it up. If someone wants to look up the address and phone number of a contact, I tell them, "ok, you look it up and know it", I don't need to say, "yeah, that's right here in my notes, it's 1347 Bunkum St".