After waiting in line 40 minutes to ride Alice in Wonderland after it re-opened, I definitely agree that the safety railing/new steps have ruined that part of the ride. I am glad that it's only a temporary fix.
While I can see OSHA's concern over the ride, I feel like they have a bigger concern next door at the Matterhorn. The Matterhorn is the only Disney attraction (that I know of) to still use old-fashioned seat belts rather than the locking safety bar. A child...or adult for that matter...could easily unbuckle their belt and be thrown off the mountain at any point. Obviously this would be a very careless thing to do, but there are very careless people in this world. To put it in perspective, the safety bar on Snow White's Scary Adventures locks into place so that it is impossible to get out of the ride until the very end.
IMO, the Matterhorn is the jerkiest (most dangerous) ride at the DLR. I thought that the vehicles had already been updated during a recent refurb and am really surprised that safety conscious Disney has allowed the Matterhorn to operate in this fashion for so long. I also think that locking lap bars would make the ride more comfortable.