Don't forget that proposed bulletproof wall around the Eiffel Tower and the large armed police presence at any gathering/event such as the Christmas markets.
In the literal sense, yes.
In the psychological sense, no.
Could be argued "yes" for both imo. Kids having to see soldiers and SWAT on the streets isn't something I had to put up with at their age. Yeah, the psychological effect may not be great, but it's still there.
Bollards are temporary and a uniformed police presence isn't, as others have pointed out, anything really new. The IRA is a decent example as saying terror has existed for longer than radical Islam. However, the psychological sense is changed because the IRA had a clear set of goals, which could be negotiated with. There's a difference between:
1. Withdrawal of the British army from Ireland
2. Political independence/autonomy
and
1. The destruction of the Western world
2. Installation of the worldwide Caliphate
So in a literal sense, terror won't change society, but psychologically it already has. Sadiq Khan's comments about "getting used to it" is proof of that.