To determine if *disable is useful in triggers, stop thinking like a one person shop, and consider the separation of duties.
If I'm the programmer, I can create applications that add/remove triggers.
For security, I would want CRTPFTRG to be completely locked down, and only usable in the install of software.
The operations staff should only control whether they are enabled or disabled, and then only with good auditing.
CRTPFTRG could be a powerful tool for cracking.