I took I-77 up through Charlotte and there was about a 10 minute delay just north of I-485 on the south side of it. Google Maps still routed me through it and not onto I-485 around the west side of Charlotte. I was wondering why but 77 was ok after the 10 minute delay and had a few pockets of slowdowns through Charlotte but wasn't too bad. I'm in Statesville right now spending the night. I spent two days driving around South Florida as well.
A 10-minute delay is actually quite good for Charlotte -- sometimes the delay can stretch much longer. Glad you didn't have any other issues on I-77 through the city. Depending on the time of day, phase of the moon, the way the wind is blowing, and who knows what else travel can be easy or harrowing. The big difference between 77 and 485 is the number of lanes and better exits -- some of the on- and off-ramps on 77 are short and/or close together and people tend to weave across lanes at the last minute to hit an exit ramp.
As to I-26, it too is a major pain. In all our travels up and down it, some trips just outright sucked (same for I-95) in South Carolina. It was almost impossible to stay in the right lane due to those traveling under the speed limit and it was a problem to run in the left lane, even at 75-78 MPH because of the people who thought no one should get in their way of traveling in excess of 85 MPH. Sorry, but I'm not going to move right and lock up my brakes to slow to 55 just to make your life easier -- I'll move when there is appropriate room in the right lane.
When you are on I-77 not too far into West Virginia and pass the exit for WV 112, wave toward your passenger window and I'll be sure to wave back from over several ridges at home in Blacksburg.
Bruce in Blacksburg