I've had "l" aliased to "ls -lhp" for so long that I can't work properly without it. I think many distros also alias "ll" to "ls -l" by default (I think CentOS/RHEL does it at least).
alias l="tree --dirsfirst -ChFL 1"
alias l2="tree --dirsfirst -ChFL 2"
alias l3="tree --dirsfirst -ChFL 3"
alias l4="tree --dirsfirst -ChFL 4"
alias l5="tree --dirsfirst -ChFL 5"
I, too, have "l" aliased, but years of muscle memory I still type "ls -lahp" every single friggin' time. Hey, at least it's portable when I'm ssh'd to another system.