The new version, the Arena opened well before that. Quite possibly its heyday in terms of "feel" - the concrete bit felt very modern and the concourse didn't have all the clutter of the Arena bridge and the gateline with all the advertising above it (removing that would be a massive quick win, it's oppressive).
It's since had the roof replaced, of course, but to me that never made *that* much difference, and the new roof is a cheap and nasty blow up plastic thing that to me looks rubbish.
This:
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is what it looked like around 1997 - classic concourse (much more spacious without the Arena bridge and gateline) and the platforms themselves were quite modern-looking (and still clean back then) bare concrete.