I suppose if you have one PC, and you have one password, then 123456 is fine. If you have 10 PCs and a server, you really don't want someone hacking in, setting up a backdoor, and monitoring your network forever.
If you can use the phrase:
I went to Ocala Vanguard Highschool in 1974 then:
1WtO*Vhsi97. isn't too hard to remember. And, not many hackers will crack it.