My rear-drive Toro requires not even that much effort to to backwards. Just letting go of the engagement handle for the Personal Pace unlocks the wheels and it goes backwards without any additional steps required other than pulling it backwards. It really is very slick.
In the over-researching I did before making my purchase, I came to the conclusion that front-drive were cheaper to produce, hence found on lower-end machines, and not as reliable/rugged as rear-drive. What I saw at the dealers I visited supported that, as the lower-end machines were all front-drive and the mid-range and higher-end were rear-drive.
Also for any kind of use on slopes or hills, there was near-unanimous recommendations to get a rear-drive machine from pretty much everyone I talked to.