I've done two inter-professional placements. I found the placements themselves quite good, it was useful spending a bit of time in a different setting and being able to meet students of other professions.
However, the projects that we were doing weren't what we would be doing as qualified professionals - in my second one we were basically researching our supervisor's dissertation for her.
I agree with your comment that it seems a bit tokenistic. I haven't met anyone who actually felt they gained a great deal from the experience, and the general view seems to be that it's about ticking that box to say you have done inter-professional work, rather than anything else.
I had a bad experience with one student nurse in particular. As soon as she found out what course I was on she started telling me how useless social workers are etc, and make some rather offensive comments. When I tried to stand up for the profession she wouldn't even listen and and just said that she didn't care if I was bothered by her comments.
I agree that it would be good if other professionals were involved, but it seems enough of a nightmare as it is now. Our units have been during our placements, so just as we have got settled somewhere we've had to go and do a two week IPL placement somewhere else. Other students said the same, basically whenever it was it would have interfered with somebody's course/placement.