What really helped the HR totals were all the new ballparks being built with short porches, not just the juice.
Nobody can really deny that juice wasn't
a part of the HR explosion, but it is only a part. If it was, the aforementioned Brady Anderson would have hit 50 every year he juiced. There are a multitude of factors that all led to inflated offensive numbers.
1.) New Ball Parks - As JG said, Starting with Camden Yards, MLB left the 1960's vintage multi-use round enclosed stadiums, and built baseball only facilities.
2.) Expansion - Watered down pitching once Fla, Tampa, Colorado, and Arizona joined. Too many arms not ready to be starting pitchers and too many relievers that belonged at AAA.
3.) Questek and the Change in the Strike-zone - MLB mandated a tighter strike-zone, and went to a machine in some parks that would evaluate umpires. This was a result of
a.) The Atlanta Braves with Maddux and Glavine consistently getting the call off the plate
b.) Eric Greg's fiasco in the '97 NLCS where he had a strike-zone of enormous proportions that embarrassed MLB. Umpires would not risk calling a questionable strike in Questek parks, and that forced pitchers to throw belt high down the middle. Hitters can kill that in
ANY era.
Bonds, McGuire, Sosa, Albert Belle, etc. hit plenty of homers before they became superhero sized. While juice may have made them stronger, you can't hit 60 or 70 homers without a pitch to hit. I watch baseball from April to October every year. I vividly recall the year that Bonds hit 73. McGuire and Sosa were all the rage, and had 20+ homers by the first part of June. Bonds had half of what they did. Bonds came to Atlanta and hit 4 solo shots in 4 games, and took off from there. Let's also remember that Bonds left Candlestick Park which was windy and dead for hitters for PacBell (or whatever they want to call it this week) that was very hitter friendly. Visiting there, my wife caught Bonds 687th!
His approach at the plate was to crowd the plate (wore a huge elbow pad as protection) to get a good look at the strike zone, choke up to get the sweet spot covering the plate, and to turn and hammer anything in the zone, and lay off the soft stuff on the outside corner because the pitcher never got the call.
Pitchers would get behind in the count, and come in with a fastball and boom! Conversely, he knew when to look for offspeed stuff away and would get all in it when he found a hanger. the most amazing part of that was his concentration - he almost never popped up or fouled off a meatball that I saw all season. Roids didn't give him that concentration, its not brain food.
So let's acknowledge that the Steroid Era produced some artificially strong strong players, but also agree that there were other factors that made the balls fly.