I would try to look up the rides on u-tube and get a full version of each ride. Watch it very carefully. I would perhaps take anything looking borderline to the doctor and see if he will watch the video and give you his opinion. I would think he will be on the side of caution. You may not be able to find full versions of each ride; so, this may make it harder to decide. There are other websites that might have Disney rides; so, do a search. I believe some rides have warnings and I would read each one very carefully.
Also, I think I would be on the side of caution. One Disney trip is not worth the possible headaches later on.
Try to see Disney in a different way this time. Go see more shows and enjoy the live street entertainment. Maybe, the girlfriend is willing to stay back at the resort more with him.
There is a list of rides with warnings, plus a little more about WHY it may have a warning in a post on page 2 of the disABILITIES FAQs thread.
For the ones the OP listed, (because I don't have time to write a lot more right now):
Soarin' is gentle, easy to get into and should be no problem. The only warnings are for fear of heights and motion sickness.
Pirates has no warning, but as was pointed out, there is a drop in the dark which can be a problem. The seats have low backs, so not much support.
People Mover is not a problem, but to get up and down from the second floor 'station' guests need to use a steep moving ramp. The position you are in ( with feet sharply flexed) may cause issues for some people.
Toy Story - I agree with the other posters.
Haunted Mansion usually does not jerk to a stop; it usually slows to let guests with disabilities to get on. If it needs to stop, they will slow it and then slow to a crawl before stopping. The only time it should 'jerk' stop is in an emergency.
There are no WDW warnings for Haunted Mansion, but there is one place where the doom buggy goes down a hill backwards. Since the rider's weight is on their back against the hard plastic doom buggy, some people find that portion uncomfortable.
Spaceship Earth has a similar backwards section, but it is much longer than the one in Haunted Mansion.
Also, in post 3 of the disABILITIES FAQs thread, there is a link to a 'ride through'
Video of WDW. It is an interactive video showing a guest walking around each park and when you get to n attraction, the guest allows you to choose o go on it, which links to a video of the ride. You can also choose to not go on, which continues the walk to the next attraction.
You can find the isABILITIES FAQs thread near the top of this board or follow the link in my signature. Post one of that thread is an index to the information in the rest of the thread. You may also want to look at posts 18-22 on page 2 of the thread. They are about navigating the parks with an
ECV or wheelchair, but also have information about the step in or out for the attractions.