I am currently a BM for the second time. And I plan on being engaged in the not too distant future. In both weddings I have been in, I have not been very involved.
The first time, I was a BM and the MOH did not talk to me. I got a text one day saying to stop by and get fitted for a dress. Then later a text saying the dresses were in. Me and another BM put on a Bachlorette party because the MOH would not speak to us. I missed the shower because her sisters put it on and did not tell me till two days before and I could not get off work. 
This time, I have been  more involved. I helped at the shower her mother put on and the Bachlorette weekend with the other BMs. When I hang out with the bride she tells me  how nice it is to take a break from wedding things, so I do not ask about it. 
When I get engaged, I kind of expected my BM to help out and offer suggestions on things, like my dress, BM dresses, accessories, food, colors, ect. Am I expecting too much?
His mother is no longer alive, and my mother is not well enough to help. I was kind of counting on my friends to fill that space a bit. Should I start looking for an alternative source to help with the wedding when it comes?