I think that part of the disparity is in frequency of use: if you cook on a daily (restaurant) or even weekly (enthusiast) schedule, you won't have problems. If you only grill on major holidays, you won't be able to just use it without cleaning.
Also, a grooved scraper with the right spacing for your grate does a great job of removing large chunks. You don't need to polish it to bare metal, just remove that excess. Scrape after grilling while it's hot, wait a week, wipe with a paper towel dipped in olive oil when it warms up, and it works well enough for me.
Incidentally, the occasional griller is also the exact person who would most likely be least aware of the danger with a wire brush... sort of a perfect storm situation
Also, a grooved scraper with the right spacing for your grate does a great job of removing large chunks. You don't need to polish it to bare metal, just remove that excess. Scrape after grilling while it's hot, wait a week, wipe with a paper towel dipped in olive oil when it warms up, and it works well enough for me.