For Canada, the data is easy to find, since it is all public. Here is average and 90% (when 90% of the patients have received care) data for non-urgent CT scans in the province of Alberta. Before the pandemic hit, average and 90% were approximately 12 and 20 weeks. Due to the pandemic, now they are double. Ontario is doing much better. You can see their data in the second link.

http://waittimes.alberta.ca/WaitTimeTrends.jsp?rcatID=19&rha...

https://www.hqontario.ca/System-Performance/Wait-Times-for-D...

This has been my experience as well.

The complaints I frequently hear from Americans regarding 'socialized healthcare' never ring true based on my experience in countries like the UK or Australia.

Key word is "non-urgent".

If you have good insurance in the US, you'll get a same-day CT in a hospital setting to bring in some revenue where a quick xray would suffice.