Yeah, Plus Speinger and Sandstorm were the two earliest figures of rcent Transformers that I see as being the start of the extensive remoulding we see now. I keep thinking back to Galaxy Force Starscream and Vector Prime. Those were some chunky (and the first classification of) Voyagers. Both remarkable simple toys as well.
The thing that kind of got me thinking about this though was Windblade and her incredibly gappy vehicle mode. I can't really think of many earlier transformers that were so thin and holy. Even Cyclonus of the Henkei henkei variety was a tad better.