Sokol - while blade shapes have changed significantly, the disc loading and therefore the downwash has changed enormously, mostly due to the gas turbine engine with its far superior power to weight ratio.
You can either take a large area of air (big rotor disc) and accelerate it a small amount (uses less power) or have a smaller area of air (smaller rotor) and accelerate it a greater amount (uses more power) to achieve the same rotor thrust to balance the mass of the aircraft. Modern rotor discs can be smaller because the engines are more powerful - hence faster downwash speeds.
Light pistons such as the R22 still have relatively low disc loading, hence they are more vulnerable to VRS because their downwash speeds are slower and it is easier to catch the rotor wake up in a descent.
The biggest change in helicopter blades design is not the lack of taper but the change in aerofoil sections, moving away from symmetrical to cambered shapes, especially with composite blades where that section can be altered along the length of the blade. Additionally, the lift is varied along the blade using twist rather than taper so the root is at a higher pitch angle than the tip.