Hi, I was able to come up with a good technique for taking apart older electrical connectors, some probably untouched since the car was new.

After seeing articles about special tools to depress the holding latch or to pick apart stubborn connectors, I came across something that was free and worked for me ... and did NOT require any tools or lubricants.

The advice is this: when applying pressure on the latch release, push the connectors TOGETHER for a moment and then try pulling them slowly apart while still holding the latch down. It seems the pushing together action helps the latch clear the stay on the other connector and it also helps loosen the connector surfaces so they will slide apart easily. Try not to wiggle the connector side to side (as I was doing on other connectors and fighting for minutes) but try to make it one even pull so the connector's sides don't bind. This worked very well on my crankshaft sensor, which had to be a one-handed disassembly.
Hope this helps someone down the road! Thanks.