Pop Medley I am Easily Amused…

It isn’t that they are cool chords, it is that there are chord sequences that move a melody forward and bring resolution to a song. They tend to be used over and over again in many, many, many songs. The entertaining thing is to pick songs in the same key signature and see if they all blend into one song, like these guys do.
When you step outside of using these chord sequences, you can create interest and tension in the music, but you can also frustrate your listeners because they tend to know what to listen for and they DO listen for it.
In music, chords and keys signatures and time signatures are just like the alphabet in writing: same letters over and over again, some used (and needed) more often than others, but SO many words, and SO much meaning from those 26 symbols.