After WWII it was a little bit, as an art gallery and performance center. But its proximity to East Berlin ensured that it was never very popular. After reunification in 1990 the German capital was moved from Bonn to Berlin, and the Reichstag was refurbished, and renovated by Norman Foster.
Do you recognize this picture? (Although the actual event wasn't photographed, it was staged again afterwards for the picture.) It is the Soviets after they captured Berlin. They headed to the Reichstag, because it was wrongly assumed that this was Hitler's headquarters.