I think it depends on the estate and why it's gated I live on a private cul de sac that, technically, is gated.
My little estate used to be a farm yard, a lot of our houses are converted from the old farm buildings. There is a wall all the way round it, but it's always been there and the conservation officer insisted it remain when planning permission was granted.
99.999999999% of the time the gate is not closed, but as the council refused to adopt our road, in order to maintain the private road status we have to close the gate once a year, otherwise it becomes a right of way with us still responsible for the maintenance and repairs
We're not all large, detached houses either. The original farmhouse is large and detached, but the rest of us are 2/3/4 bed semis.
We did have issues with people taking the piss regarding parking - we have a little pedestrian cut through which comes out behind the primary school and lots of parents found it a convenient place to park and take their kids to school, however, instead of being considerate they parked on people's driveways and all over their front gardens, blocked the road and generally behaved like arseholes, so we had an electronic bipper thing installed and started closing the gate which stopped it. The gate is now back to being open all the time
Our gate makes no difference to security even when it's shut, it's a waist-ish high 5 bar gate, not huge imposing gates