Let me be clear once again. Disneyland's maintenance policies in the last 90's were not the cause of that accident. Disneyland adopted two "controversial" policies that people feel contributed to the accident, one of which actually did but was not related to maintenance. The first policy was to clear the inventory/stockpile of replacement parts and only order the ones that were immediately necessary. This led to a delay in receiving parts in a timely manner. This did not, however, result in any unsafe operations or maintenance practices. It simply meant that Disneyland of the late 90's had a rash of almost daily downtimes that lasted for significantly longer because of a lack of needed replacement parts. Some items literally needed to be shipped overnight around the globe to get a ride open after a part failure. If a part was beyond it's shelf life or it broke, the ride was closed or the train in question was not permitted to run. Still, this downtime caused people to assume that maintenance was being deferred- it was quite the opposite in reality. If you think Disney's maintenance would put the liability on themselves for running an unsafe ride, then you've clearly never worked there. They are the most litigious people on earth policy wise. There is always an amount of blame that goes around during downtimes or incidents, and maintenance has always striven to avoid being 'charged' for anything that results in an problem. This policy is still in place at WDW and DLR. I don't think it's the most efficient or effective policy to order parts only when needed, but it does not affect safety. It affects downtime and causes deferred maintenance on non-safety and non-ride system stuff.
The policy that DID result in Thunder Mtn's infamous death was that CM's were completely lax in reporting maintenance issues. They were also relied on to add/remove trains (from nearly all rides at Disney, a practice which is unheard of anywhere else). When a part failed, Cast Members did not call maintenance and instead decided that if the train continued to make an abnormal noise that they would pull the train and then call maintenance. This was a major violation of policy. While CM's had the right (under the direction of leads/coordinators/whatever they're at DL called now) to add/remove trains for capacity and staffing reasons- the policy was quite clear for abnormal noises. E-stop the ride, immediately, at all times. Worry about evacuating guests and powering back up after the ride has been inspected by maintenance. Instead, the ride vehicle was dispatched with riders, which unfortunately meant the end of a guests life. It's horrible, and was a shocking violation of operations policy. The (foolish) policy allowing CM's to transfer ride vehicles remains in place and has led to many close calls on Thunder Mtn, California Screamin, Splash Mtn, Matterhorn and others (this is just the stuff I've been told through the grapevine, nothing official) but the policy is flawed and is still in place at all Disney parks except Tokyo. However, the policy that led to the accident, which was a failure to E-stop the ride and call maintenance, has been drilled into operations CM's since that horrible tragedy. Anything abnormal should trigger an immediate E-stop- every time, no hesitation. That was the policy before the accident, and it remains in place after- it's just emphasized far more now.
And just to be clear, complaining to Guest Relations about alleged poor maintenance practices resulting in unsafe conditions is utterly idiotic. It's like complaining to Delta's guest relations if hear that Delta is flying aircraft with a recalled part. You'd obviously call the FAA for that. If you feel/felt there's an issue with Disneyland's upkeep/safety- please let CalOSHA know about it. While I don't care for their version oversight, the fact remains that they do have the authority to investigate claims of that sort. If Disneyland truly engaged in a multi-year scheme to defer maintenance and allow rides to operate in an unsafe manner, Disneyland would be raked across the regulatory coals and publicly crucified. But that never happened... Nor will it.