I don't think anyone in the astrophysics community thinks we're alone. But the physics also suggests that unless they are extremely common it's unlikely that we'll ever detect any (let alone meet any). So practically we are alone.

Outside the astrophysics community the majority of scientists I know also believe in life but similarly don't think we will detect/meet them. But there are some that don't believe (I don't know a single person in hard science that thinks we're alone but I do know engineers and those in soft sciences that reject the notion).