Poole has a big linkspan that the ferry usually lowers its ramp (also an outer door when raised) onto. This has flaps, or longer fingers, on the end to take out any cross-slope. This linkspan also has a ramp on it it can lower, but this can also be raised as a whole high enough to leave the linkspan clear. The only pictures I can see are agency ones but e.g
Alamy has it down, and
dreamstime has it raised (see also Google Earth).
So I think that these days ferries have an outer door to protect the inner one, and this forms a pretty good ramp. Somewhere like St Malo has a long linkspan to cope with a large tidal range. This is heavy and cumbersome to adjust, and it's a lot easier to use without a ramp on it. But I'm sure I've seen them with a split arrangement, and a half-width ramp on the linkspan (or fixed quay if that works).
I don't seem to have pictures of any of these things, despite using loads of them. You'd need to be a passenger to be able to get pictures, I think.