Sudo configuration for NOPASSWD: ALL

Question

Hey all,
I have a new mac with a fresh 10.8 installed. It's 2 days old and (probably) in the best shape of its life. Here's the problem:
As a Linux guy, I'm using sudo alot and it prompts me for a password every single time. Example:
host_name:~ user_name$ sudo cat /etc/autofs.conf
Password:
etc...
This is getting tedious. In Linux we simply add ourselves to the wheel group and uncomment this line in /etc/sudoers:
# %wheel ALL=(ALL) NOPASSWD: ALL
I've done some troubleshooting on my own but all paths lead to more questions:
Step 1; find out about me:
host_name:~ user_name$ id
uid=501(user_name) gid=20(staff), groups=20(staff), 401(com.apple.access_screensharing), 402(com.apple.sharepoint.group.1), 12(everyone), 33(_appstore), 61(localaccounts), 79(_appserverusr), 80(admin), 81(_appserveradm), 98(_lpadmin), 100(_lpoperator), 204(_developer), 403(com.apple.access_ssh)
-good.
Step 2; grep /etc/passwd for my user account
host_name:~ user_name$ grep user_name /etc/passwd
-nothing.
I can't find my user_name in the password file; OK, now I'm confused.
2 questions - 1 purpose:
How do I configure /etc/sudoers to not prompt me for the password at all - ever again? OR
What's the preferred method of getting the same functionality in OS X?
Thanks in advance,
TT

Answer 1

This was a "Duh" moment for me. I steped out, had some dinner and a scotch, and magically, the answer came. Being a member of the "admin" group, it was that line which needed modification, not wheel:
Open the Terminal
sudo visudo
Change this line FROM:
$ %admin ALL=(ALL) ALL
TO:
$ %admin ALL=(ALL) NOPASSWD: ALL
Write and Quit
:wq
Retest successful; sudo no-longer nags me for a password.
Scotch is good.