A great big NO from me.
Feel free to get into them if you're interested... don't rule anything out... if you're the sort of person who likes rules and theories, they will definitely help you understand why things work.
But you do not need them. The most important thing is your ears - use them first. If it sounds good it is good.
You could do what I did. Learn the pentatonic/blues scale in all 5 positions, then try adding 'extra' notes in songs and see if they fit. That's basically adding the notes from the modes but without the theory ;) Works for me so I can get by.
Oh, and learn little licks from your favourite guitar players. Then you can throw those in to create your own mix-up of solo style. Mine's somewhere between Angus Young, Billy Gibbons and a hamfisted amateur :lol:
That's exactly what I did :D (slightly different guitarists as my main ones, but those two were high on the list as well)
When you've got happy enough to stand in front of an audience like this and make like a guitar-hero, you'll possibly find yourself "stagnating" in your own mind after a while. You aren't stagnating at all, but you'll feel like it. For me personally, that was when modes got interesting - they can help you break out and learn some new tricks in your daily practice/noodling, and you'll understand nodes a lot more if you can recognise bits in them that you already do by ear anyway.
But don't
ever get into the frame of mind where you think "I'll play a bit of dorian and then some twidlian (I don't even know the names!) followed by a few phrases of doodlian, finishing up with a great big ascending knoblian... that'll make a superb solo..." - you're human, not a computer, make music like a human, like you talk, not like a computer...
:D