As for travelling since 9/11, I did go by bus to Knoxville, Tennessee to visit my cousin in October of that year.
And I've traveled by car to other places (as a passenger).
This will be my first trip outside the country since9/11 by plane, and with the extra sec, checks as well as going through customs, yea, this should be interesting.
I have flown a bit, and although it does take longer because of the security checks, it is also reassuring that they are being diligent! They have also become more efficient thoughout these 3 1/2 years in getting people processed! Have a wonderful time visiting your relatives.