I've fortunately not experienced (yet) a severe wake turb encounter on takeoff ( though maybe just a tadge of it ).
However, whilst once following a B747 into STN, I had my 737 roll from 25 right bank through to 45 left bank ( all accompanied by the automatic "Bank Angle" warnings ) - all in the space of about 3 seconds !
Similarly following a B737-800 into CPH one night ( indeed I latterly asked ATC if it was a B757 we were behind ) - whilst in a 25 right bank, to intercept the localiser, we were rolled to 40 left bank ( and again plus the "Bank Angle" warnings ) all in the matter of just a few seconds !
Nb. Both of these events occured when the spacing, according to ATC (and our TCAS), was deemed adequate ( read 'Minimum' ) !
And let's not forget that we had the luxury of several thousand feet of air between us and the ground - so let's all be carefull out there !!!