Here's what I do:
$user = Read-Host "Please enter the user to disable(Logon Name)"
This lets us enter in the person we want to disable through a prompt. Once the username is entered, the below command disables the user.
Disable-ADAccount -Identity $user
If you know the user's logon name or have the Distinguished Name you could skip the Read-Host and just enter the username in place of the $user variable
The last step is to move the disabled account to a different OU.
Move-ADObject -Identity $user -TargetPath "OU=ToDelete,OU=Students,DC=test,DC=com"
This works well and does everything I need. However, it's 3 lines and I try to keep things as short as possible. I haven't put in enough time to get it to 1 line, so I'll settle for 2.
$user = Read-Host "Please enter the user to disable(Logon Name)"
Disable-ADAccount -Identity $user | Move-ADObject -TargetPath "OU=ToDelete,OU=Students,DC=test,DC=com"
Hope this helps someone.