On our February vacation we were a group of 11: DD/DSIL, DS/DDIL, 5 young grands (ages 5y, 3y, 3y, 21 mo, and 4 mo), DH & myself. We stayed in a VRBO pool home offsite. It was not a holiday week but the parks were packed. All the kids and grandkids went to DHS for one day (no G+) and we all together went to MK for one day (with G+).
DHS without G+ or ILL$:
4 adults and 5 littles arrived early enough to rope drop M&M RR and waited about an hour, behind all the EE onsite guests. They probably should have RD'd SDD because it was their priority ride, after the kids had seen a POV video of it. But they weren't sure if a coaster should be the young kids' first ride of the day. So by the time they reached SDD mid-morning, they had to wait over 2 hours to ride SDD. The long waits with these age children were really difficult for all of them, made worse by unseasonably hot (90's) & humid weather.
Fortunately, a CM with a tablet approached the worn-out, waiting Moms & babies, took pity on them, and

gave them 2 free LL return times for other rides (with limitations, not for headliners). After SDD, they all used the LL's for back-to-back rides on TSMM, which everyone thoroughly enjoyed. They then returned to the pool home for lunch and nap time.
DS/DDIL had FL AP's so they were "done" with their DHS visit for the day. DD/DSIL left their children with the rest of us and went back to DHS to try some more headliners, especially hoping to try RotR for the first time. In the last 4 hours of the day, they rode ToT and RnRC, ate some food, enjoyed the atmosphere, and got in line for RotR shortly before park close. It was a fun "date night" for them, after a rough morning. We all decided that with the number of long wait times for attractions that interested them in DHS, it would have been worth buying G+ there. Having small children with them made it matter more.
MK with G+ but not ILL$:
Since we were offsite, we RD'd JC and had less than a 10 minute wait since Adventureland is not open for EE. The Dads and 5y went to BTMRR standby (25 min) and we scheduled our 1st G+ LL for Pooh for after noon

but we probably should have booked something earlier, while in line for JC or taken PPF which was for late afternoon already but we could have stacked other late rides in the meantime.
Over the course of the day, we got G+ LLs for Pooh, Buzz, Speedway, Princess M&G (wasn't needed), and BTMRR. The day was heavily punctuated by breaks for bathrooms, coffee, snacks, nursing, diapers, coffee, snacks, Dole Whips, coffee, etc. Having little kids in tow is SO different from bringing older kids and adults to the parks.
We waited standby for Jungle Cruise (5-10 min), Small World (15 min), Carousel x2 (10 min, 15 min), Peter Pan (55 min

where having PB&J sandwiches on hand helped), Treehouse (no wait) for some while others rode Magic Carpets (20 min), Space Mtn (50 min during a brief drop in wait time) for some while others rode CoP (no wait) and Buzz (G+), Under the Sea LM (15 min), Mickey M&G (10 min), Barnstormer x2 (5 min), and a final, 2nd ride on Buzz (no wait). Our wait times were among the shortest waits for each of the rides that we saw for most of the day and we took advantage of Genie's projected patterns for wait times. For example, Small World posted a 45 min wait when we came outside after riding it. We tended to be ahead of the curve by going to the slower loading rides early and we only got in line if the posted wait was < 30 min, except for highest priorities.
While passing in front of the castle, we paused to catch the end of a drum corp performance, followed 10 minutes later by the Princesses Cavalcade. We also saw Buzz Lightyear hamming it up on a Tomorrowland stage. And we held the children up at eye level so they could see Enchantment which we all enjoyed very much. Note that we did NOT ride PotC, HM, or 7DMT - the first 2 would've been too scary and most of the kids are too short or timid for the 3rd. Splash was down for scheduled maint but wouldn't have suited the kids either. PeopleMover was down for most of the day. If we had used G+ differently, we might have been able to swap out some of our choices for some of those popular rides or Dumbo, TomS Island, Tiki, or RiverBoat.
Thoughts about G+ & ILL$ at MK & DHS with little kids:
We did feel that we got decent value from G+ at MK. However, since our group included so many little ones, and no teens, most of the headliners weren't really on our radar. So we probably wouldn't have missed it much if we just RD'd JC, then PPF, and went by the Tip Board/Projected wait patterns for everything else, as we did for all the standby rides. Having onsite access to morning EEH would have helped even more, IMO. If 7DMT was a priority, it could be accomplished during EE or ETPH, or may be worth paying ILL$. Maybe.
Now with a greater interest in headliners and fewer rides overall at DHS, I think our group would have benefited most from onsite access to morning EEH, RD'ing SDD and the rest of Toy Story Land, and trying for ILL$ for RoTR, then pushing priority remaining headliners toward the evening unless a reasonable wait time is found. There are several shows for the middle of the day that could appeal to kids... IJESS, BatB, LMRA, and Frozen Sing Along. G+ would have been helpful too but I suspect EE and having a better RD strategy would have been best.