Are all these duct taping on my furnace normal?
Perfectly normal sealing of penetrations by wires. Looks like a first rate installation.

BTW you have a tee fitting on the condensate line which is well placed to allow cleaning of the line to clear it of algae or wet dust. Many pretty good installations do not have this feature (mine doesn't). It seems to me that you should gently insert a rubber stopper in the open end. This would prevent something falling in and would reduce leakage of air out the condensate drain. At the very least put a loose cover over it to prevent something falling in.