26 is a lot, but in the nineties SG-1 was doing 22 a season, The X-Files averages around 24. Babylon 5 did 5 22 episode seasons and Quantum Leap finished on a 22 episode season. Seaquest DSV averaged around 22 a season before being cruelly axed... Friends did 22 episode seasons until it's death in the 00s as did Frasier. ER started in the 90s with 25 episodes and hung around that number until it's end.
I agree with the sentiment that 26,25,24... it's too many. But Star Trek wasn't the only show in the nineties doing 20+ episode seasons and the nineties isn't even where the practice ended. CSI was doing long seasons beyond the 00s, then there's CW shows like Arrow, The Flash, Batgirl and Supergirl and which are doing 20+ episode seasons as far along as 2021.
I'm sure there are more.
Please don't hate me, I hate to nitpick, but Star Trek being the only show in the nineties doing long seasons just isn't true at all, nor did the trend to do so disappear.