Um, Gohan High School arc wasn't by Toriyama at all. Anything after Cell, didn't have Toriyama hand in it all. Buu Saga has some pretty decent moment, but it also uneven in it's levity, and forgetting it's character growth, and Buu having... the most forms. It got kinda of silly. I'm particularly not a fan of Goten, even though I love the idea of the Fuzion and it's Dominate/Submissive thing going on there. (I do want a fatenks plushie though. >.>)
----
And the Frieza saga wasn't the longest saga in DBZ. It's actually the second shortest, with the Buu Saga being the longest. But the 3 Saga aren't terribly different in length. Frieza Saga is 24 percent or so the series, where the Cell Saga is about 29 percent and Buu Saga about 32 percent.
The other two that came after Frieza are more shameful in how long it took. The Cell Saga had 3 things to set up. It had to set up Future Trunks, the Cyborgs, and Cell.
Whereas the Frieza Saga had to set up Vegeta, Frieza, Namek (the planet), Nameks (the race), Icer Empire (explaining why Goku was sent to Earth in the first place), why there so few Saiyans, what a Super Saiyan is and a couple more things after this. That is a lot stuff to set up. Yet during the 70 episodes, we got two training sequences, two adventures with Krillin, Gohan and Bulma, (The space kids inside the reflective spaceship, that just a solid piece of Science Fiction.), 2 groups of bad guys on Namek, and then the fight with Frieza. The fight with Frieza was going to be long. You had to respect the growth in power of the character that were on the planet, show they werent just waiting for Goku while at same time setting up how ruthless Frieza is in taking his sweet time with murdering them all. This is setting up to Show Us how strong Frieza is, and this in the end Show Us how strong SSJ1 is, with the emotional trigger of Krillin death (which at least for me made me cry seeing it).