There are actually no attractions that have a specific warning to avoid them if you have a pacemaker.
A long time ago, the Guidebook for Guests with Disabilities did have some specific warnings, but those have not been in the Guidebooks for many years.
I don't know why they removed the warnings; it may have been that they shielded their attractions that had magnets or any signals/waves that may have caused a problem. It may be because pacemakers are shielded better than earlier pacemakers were or it could be that they found that less things affected them than they thought would.
I know that when cell phones first came out, having one in use to close to a ventilator (breathing machine) could cause the ventilator to reset. That is much less likely now - although we still limit where people can use cell phones in the hospital.
If you want to look at the official Guidebook for Guests with Disabilities, you will find a link to the one for each park in post #3 of the disABILITIES FAQs thread near the top of the thread list of this board (there is a link to that thread in my signature). Also in post #3 of that thread, there are some other threads that may be helpful - one is about electromagnets.
You probably should also contact your doctor to see what warnings may apply to your situation.