This is one of the reasons ATC maintains a certain separation between landing aircraft. For larger airliners which produce more turbulence, this separation needs to be greater. As you can see from the video, wake turbulence migrates downwards over time, so after thirty seconds or so it's no longer an issue for other aircraft on the same glideslope.

All aircraft produce wingtip vortices that create wake turbulence in flight. The vortex strength increases when the aircraft is heavier and when it flies slowly. Thus, the term "heavy" (unlike light, medium and large) is included by heavy-class aircraft in radio transmissions around airports during take-off and landing, incorporated into the call sign, to warn other aircraft that they should leave additional separation to avoid this wake turbulence.

https://en.wikipedia.org/wiki/Heavy_(aeronautics)

I was flipped sideways on short final in a 172 from a 7x7 (can't remember exact plane) that landed ~2 minutes prior on a parallel runway... it happens, though the vortices tend to sink fairly rapidly and are more of a concern for smaller aircraft.

This story is fairly interesting: https://www.nbcnews.com/news/world/private-jet-flipped-over-...

Depends. Can be very dangerous when near the ground on takeoff or landing. Heavier, slower aircraft make stronger turbulence. You especially don’t want to be a smaller aircraft behind a larger one. The vortices sink so if you’re following an aircraft and you’re at the same or higher altitude then you’re fine. If you’re lower then watch out, you might be on an intercept course.

Wake turbulence was a factor in the crash of AA587 from JFK back in 2001. The FO flying the take off encountered wake turbulence from a 747 that took off just prior and overused the rudder in response to the point it snapped the tail of the jet, an A300.

https://en.wikipedia.org/wiki/American_Airlines_Flight_587

It can definitely be very dangerous. A CRJ (50 seat, common commuter plane) can easily be rolled sideways from a 737-900 or larger. Imagine a biz jet or single-engine piston aircraft being caught in something like that.