Judo in BJJ :
YouTube - Rafael Pereira x Olianas Clement by X-COMBAT
I have the chance of training in a club with that guy and many top level judokas of France, and in that club bjj and judo is practiced equally.
The problem with bjj in judo, once a judoka has passed your guard he will stiffle your game in a pretty frustrating way by just sitting on his ass, in side control and just pressuring you hard. If the guy is bigger than you, it's gonna be a hell to get up, and obviously you won't have time for that.
I do agree that a lot of black belts in judo can have a sub part ground game, but most of them have a blue belt level in subs. That being said, I often find they're incredibly more athletic, which is an obvious advantage. The amount of strenght and explosivity required to practice decent judo is a lot more important than in bjj I think.
I could write pages and pages about what it's gonna bring you but in short...
Judo in BJJ :
-obviously tremendous help on your stand up (although you need to do a bit of wrestling too and to mix em up well, which I find pretty tough).
-you'll find yourself using your understanding of throws also on the ground too, I don't know how to explain it, but you'll see.
- you'll be a way better turtle.
BJJ in judo :
-way better newaza than the average. Better subs, incredibly better sweeps.
I find the hard thing rolling with judokas is to never leave them an opening to pass, if they do, they just control you and wait for the clock which is unbearable at times (esp against bigger guys). The other frustrating thing is guys turtling and doing nothing. a judoka with a slight bjj training turtling is just really really hard to sub.
On the positive part, at an equal level of experience you're gonna play with them in your guard like toys.
EDIT : on the trips thing, I don't really understand it either. I see a lot of judokas not really using any trip. One reason could be the range required to use them, and the precentage of effectiveness. Trips look less effective than a brutal arm throw on the whole. Then again, it also depends on your body type.