When I was growing up (back in the wild days of the late eighties and early nineties) Star Wars novels from Zahn on held to a strictly controlled path and Star Trek novels just seemed to tell whatever story the author wanted, "canon" be damned.
Well, that can't be right. That was the time period when Trek novels were subject to the most stringent restrictions by Paramound Licensing (in the person of Richard Arnold), when they became required not only to avoid contradicting canon, but to avoid introducing any major ideas beyond what was in the canon. It was the most "strictly controlled" era in all of Trek Lit history. Hell, it was the era when the term "canon" first became a factor at all.
And even earlier, in the early '80s when authors like Vonda McIntyre and John M. Ford and Diane Duane were free to bring their own idiosyncrati interpretations to the Trek universe, that wasn't about ignoring "canon;" it's just that there was so little canon at the time, so much about the universe that hadn't been locked down, that there was a lot more room to interpret the broader universe in a variety of ways.
My statement was based on my personal perception of events, and was entirely my own personal opinion so of course I was "right".
However seeing my offhanded reminiscing has started a discussion, let me clarify my statements for some of the contrarians (cough.Christopher.. cough)
When I was a teenager, Star Trek novels had no connection to the established "canon" of the shows or novels save the fact that they used the same characters, places, etc.
The events in the novels had little to no impact on the shows or movies, and in fact some of the historical interpretations found in the novels in the late eighties and early nineties (namely "Federation" by the Reeves - Stevens) were directly contradicted by later "canon" material. Therefore when you picked up a Star Trek novel, you knew you could just enjoy the story without having to keep track of the secondary characters, planets, events, ships, or tech because none of them would likely show up again. You just picked up the book, and enjoyed.
At about the same time (When "Heir to the Empire" was released) Star Wars novels and comic books were the only new Star Wars stories being told. Therefore they all connected. The secondary characters in the novels and comic books would show up elsewhere. A reader would need to read almost all available material if he or she wanted to stay abreast of developments within the Star Wars universe.
Now we come to today. Star Wars is a sprawling media empire yet again, with a MMORPG, a TV series, comics, recently released movies, etc. There are dozens of individual stories and story lines one can follow, most of which do not interact with the other. You can follow the adventures of the big 3 (luke, leia, han) or you can watch the cartoons, or you can play Old Republic online, and you don't need to know more than the basics.
Star Trek on the other hand is in a little bit different situation. New material is almost exclusively found in the novels. Characters, events, tech, and other details are connected to some extent, and the reader at times is forced to look up stuff on Memory Beta just to keep track of things.
They are still very enjoyable, but I agree that the Small Universe issue is creeping in a bit.
Elias Vaughn, Spock, Scotty, and other characters seem to be everywhere. Tiny bit characters from the TV shows are expanded on and given backstories (another thing that Star Wars was big on in the early nineties).
I personally enjoy the novels a great deal, and am almost certain that I am reading the same ones as JD, I just was making offhanded comment about how much they seem to have changed, both in their role and in their linked continuity, from the novels of my youth.