I've just bought my first Brooks, so I'll let you know how I get on....
I believe the usual method is to put a foot on a pedal, swing the other leg over and sit down....
Seriously, though.... I use brooks saddles because I too find them comfortable on short and long rides; both the 2 or so hours I commute every day and longer (100 - 300k) rides. Different models are better for my behind shape than others. Swallow > Pro > Swift = B17.
The most important thing, in my view, is that they are firm and "slippery". Gel saddles are the opposite - squidgy and you sit where you are plonked. I used to use a gel saddle, I found it great for about 1/2 hour and then nether hell slowly set in.
I think the mechanism is this:
The reason my bottom gets sore is that, because of pressure, the skin is deprived of blood supply (ischaemia). It is this lack of blood supply that causes the pain and, in the longer run, sores (thankfully never had sores myself!) With decent clothing, friction effects should not apply.
With a gel saddle, the surface deforms locally to the bottom shape and "sticks" causing continued pressure the same area with no movement of pressure points to get the blood flowing again and so no relief when pedalling. Result: steadily worsening bottom pain...
With my Brooks saddles, the pressure points seem to move freely over the saddle allowing different parts to take the strain during pedaling movements thereby letting the blood supply recover.
I suspect that any firm, slippery saddle will allow this process, not only Brooks saddles - but I have found the gentle moulding, firm texture and overall comfort of the Brooks satisfactory and have therefore not tried other saddles recently.
As with most things, one man's poison is another's pleasure... It works for me, YMMV