Yes and no.

Yes... On/After 2000, not much happened. Those incidents that did were light and usually reduced to routine software changes for those that prepared. And they usually did not make it to the press/public.

No... the effects were felt years PRIOR to Y2K. Businesses and govts prepared years in advance for it. Some governments/govt entities started 10 yrs in advance. Businesses usually 3-6 years.

Cumulatively, approx $6 billion was spent in prep to find, correct, and test for the bug across govts and businesses.

If left uncorrected, the bug would have hit businesses at the very least overwhelming internal operations with loads of low level problems that would have hit all at once. And that assumes no catastrophic issues hit.

Plus significant backup and alternative measures had to be taken to ensure business continuity.

Examples...

• Call centers had to have empty duplicate backup facilities ready and waiting in case they needed to shift personnel there to keep the business moving. Even whole offices had these types of backups in case they had to vacate current facilities, relocate and keep the business open and running smoothly.
• Large-scale power generators had to be leased/reserved if not bought years in advance and integrated into your building and data centers and had to stand by in case power went out.
• If you had critical 3rd party vendors you relied on for business, you had to get involved with THEM to make sure they were ready and would not interrupt your business if they had significant issues.

So businesses/govts spent that capital and tied up key personnel to find/fix/retest for years. That meant that other key projects like new applications or upgrades to hardware, software, network, infrastructure, security, etc. that were intended to reduce costs, increase sales, or produce new innovative solutions did not happen during this time OR were significantly delayed.

That also meant that money spent for Y2K prep not only could not be reinvested in the business or returned to shareholders. Plus that expense money spent came of the bottom line of the business and affected performance.