(A "couple" more than three now, since
@Shimbleshanks 's post made

.)
I suspect that "very small minority", overstates the case somewhat. With BR regular-everyday steam having finished in 1968: anyone aged sixty or over (which is nowadays very far from being in one's dotage) is likely to have coherent memories of said scene -- varying to some extent, according to where in GB they happened to live / visit. Encompassing a minority of members, sure; but I would reckon, not such a tiny one as all that !
I'm 73, so had twenty years of BR "bread-and-butter" steam: family and other circumstances were such that I got plenty of travel behind steam in those two decades; but not that much of it, truly long-distance. My chief experiences in the way of long-distance steam haulage, were in the 1950s, several times, between Spalding and Manchester via Lincoln and Sheffield (the stretch via Woodhead was electrified during the period in which we made those journeys). I'd have problems isolating individual, particularly-missed, elements of the "steam as the norm" scene; would just go on record as having found it overall, utterly delightful.