I think the slower build times really make a huge and positive difference to the game by dividing a round into early, mid and late game periods and that stops all the tech being available in the first few minutes of the game.
Having said that it's a balancing act and in 1.3 the build times for some structures was too long and they have been reduced.
As far as "watching" your buildings build...you could do something else with the time...like scout, harass the enemy, etc. ;)
TalonH4wk
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