I've spun a C150 a few times, because it seemed to be the only way to pass a course at the time but wasn't at-all happy about it, the PA28 not at-all.
Every aeroplane I've been comfortable spinning had a "get out of gaol" card - whether that was a BRS, ejector seat, or personal parachute and jettisonable door.
Okay, there are a few hardened aerobatic pilots who spin at very low level and thus the parachute would do no good at-all. Those pilots are usually very current in spinning and know their aeroplanes very well - so far enough, they fly other manoeuvres where there's no recovery if it's messed up either. Their call, grown-ups and all that.
But I really cannot accept the perceived wisdom in deliberately spinning an aeroplane with no emergency "route out". Maybe I know too much having studied the spin at very great length during my PhD, but I know people - better pilots than me who have jumped or pulled the handle from an unrecoverable spin, and knew somebody who didn't.
(My distant recollecton of spinning the Hunter was that it was pretty straightforward and honest - just lost a stupid amount of altitude.)
As for when it clicks - for me it's really a matter of recency rather than total time. If I'm doing the sort of flying I've been doing, say, 6-12 hours per month over the last 3+ months, it's clicked and whilst complacency is still the enemy, I can get pretty smooth and consistent. If I go below half a dozen hours a month, or are doing the sort of flying I've not done for a while (say some complicated handling tests, which I tend to only do a few times a year, or an instrument approach if I've not flown one for 3+ months, then it's distinctly un-clicked and I need to get myself back in the groove.)
G