Greetings,
Which is why I
always answer 1 d4, with 1 ..., d5.
If White then plays a Reti/Catalan system with the fianchettoed KB, I use a reversed-Colle type of system - ideally with ..., d5; ..., c6; ..., e6; ..., Nf6; ..., Bd6; ..., Nbd7; ..., Qe7; with the rooks on the e- and d-files.
Not necessarily in that move order, but pretty close to it!
If White's played Bg5, then at the appropriate moment ..., h6 forces the issue of exchanging the bishop for the knight on f6 (Black recaptures with the Nd7 whilst gaining the two bishops) or retreating to f4 allowing an exchange there or on d6.
If White plays c4 and cd, then ed maintains the "spike" (b7, c6, d5) against White's KB, whilst opening the e-file and h2-b8 and h3-c8 diagonals for Black's bishops.
Of course, this is in an ideal world!
As I stated earlier, I only use the move order 1 ..., e6 against 1 c4.
In my ealier post, I wondered if the problems arising from using it to get into a Nimzo might be avoided by entering it through a Vienna/C-S transpostion !?? In other words, slightly later.
As I don't play the Nimzo, I don't know how feasible that is... [*Paging Nimzo-Indian Specialist - Please come to the "Cox's 'Deviations' book and 1...e6?" thread*

]
It seems to me, however, that since so many White players seem to try to evade it by playing 3 Nf3, that Black players should forget the Nimzo-Indian and just concentrate their efforts on the QID!
That way, you'd only have to learn ONE complex opening as against TWO!
(I'll probably start getting pelted by "NimzoManiacs"!!

)
Kindest regards,
James