True, but all the effluence and garbage, rotting food, dead pets, spread of insects and rodents.
If everyone just disappeared in an instant, Planes would fall from the sky, cars would crash, fires would start, massive damage from scenarios like these and others. The guy responsible for the containment in Nuclear, Chemical or Biological facilities disappears before setting long term safeguards. One good week of heavy rainfall and Dams which no longer have the ability to flush will break, massive flooding, tidal bores on major rivers would be uncontrolled, half of London would be underwater. Packs of Dogs, especially the large ones who were more able to escape from their homes would soon begin to starve and start scavenging, until the uncontrolled fires in the cities force them and the rodent population out into the surrounding area's.
Ships smashing into coastlines, explosions from all manner of things, Farm crops rotting in the fields, livestock roaming and turning feral. Road impassable because of abandoned vehicles, fires spreading amongst them from the ones which crashed when their drivers just disappeared. Automated systems in critical military and nuclear facilities shutting down over time, power stations going critical, you can on and on. The reality of such a thing are horrendous and almost unsurvivable in their own right. Even if you did get through all that and whatever I haven't thought of yet, you will probably die from tetanus or infection from the sprained ankle you got from running away from next doors starving rotty, when you were looking for food, after exhausting your own, or catching dysentry or Cholera from the standing water after the drainage system backs up due to blockages from the rubble caused by the 707 that fell out of the sky a few blocks away.
It sounds like so much fun. It would be more fun if only 90% of people were wiped out over a month or so, and the scenario is far different and has more leeway.