suki22 - I'd suggest that after 40 years of driving, if you've been driving into spaces all this time, why not try somthing new. I personally back into spaces because i find it easier both ways, backing in and driving out. I drive a fullsize extended cab 4x4 pickup, driving into a spot is actually more difficult because the approach angle is much sharper than backing in.
The majority of people who ride with me hate it when i back in, because im not the typical dork who looks over their shoulder etc. I use mirrors, thats the way i've been trained as i spend these cold maine winters plowing snow, and if you think you can back straight down a 1/8 mile driveway in the snow looking over your shoulder, think again.
I've got friends who tell me "one of these days you're gonna hit someone because you arent looking over your shoulder." But when looking over your shoulder you have 1 blind side, whereas using your mirros you've got a much better chance of seeing all around you, that is, if they're adjusted correctly.
Maybe it just depends on what you drive. to each his own.