I bloody love the lane-keeping thing on our Leon - that plus radar cruise makes long boring distances very easy. Accelerate to 80, turn cruise on and you basically don’t have to touch the pedals or steer again until you turn off. Minor adjustments to distance keep your place in traffic.
If you indicate to change lane the lane keeper doesn’t interfere and it also deactivates under 40mph so low-speed manoeuvres are fine. The radar cruise will slow you right down to a stop and then start you off again, so traffic jams become less fatiguing. I have turned all the various ‘bongs’ off though as they’re distracting.