When my wife and I play golf out of town, I always look for women's tees that are just under 5000 yards in length.
At this length, she can hit most par 4s in regulation if she hits two decent shots. Strokes are lost when she misses a shot that goes 20 yards.
As far as course designs go, it's more than just length. At my home course we have four par 4 holes that are 320 yds. or less from the men's tees. Two of them are those *%$*! risk-reward holes that often produce the highest scores of par 4 holes for the average golfer. The pair have well-bunkered funhouse greens, and unless you're a dart-thrower with your wedge you can run long or back off the green into bunkers.
The scorecard puts these two at #15 and #14 HDCP, but the Senior Group has designated them as #5 and #6 HDCP for our weekly best-ball scoring.
Feel ain't real. Joe Mayo isn't talking about feel.
In order to swing a club 100+ mph, lots of muscles are firing, stretching, pulling, etc. There's nothing relaxed going on, despite how effortless or smooth it may feel to the person doing the swinging.