what other movies might I like?

Oddly enough, I see "Hello, Dolly"(1969) as part of a "trilogy of last gasp sixties musicals" that came out in about the same one-year period, one at the beginning and then two together at the end:

"Finian's Rainbow": late 1968, starring Fred Astaire, Petula Clark, and Tommy Steele...directed by Francis Coppola! With George Lucas as his student assistant!

"Hello, Dolly": late 1969, starring Barbra Streisand, Walter Matthau, and Michael Crawford, directed by Gene Kelly.

"Paint Your Wagon": late 1969, opened aroudn the same time as "Hello, Dolly" from Lerner and Loewe, directed by Joshua Logan, starring, Lee Marvin, Clint Eastwood, and Jean Seberg.

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The reason I see these three as a trilogy(and apart from such more stodgy musicals as "Funny Girl," "Star" and "Oliver" released around the same time) is that they were oddly "hip and funny" musicals with hip and funny stars...I mean, who would have figured Walter Matthau, Lee Marvin and Clint Eastwood for MUSCIAL stars? Meanwhile: Streisand was certainly a musical star, but a sexy young one, and Petulia Clark in Coppola's VERY hip "Finian's Rainbow" sang with plenty o' sixties sex-and-sassiness in her songs, its almost "rock and roll singing."

I like "Hello, Dolly" for the sass of Streisand and Matthau together. I like "Paint Your Wagon" for its melancholy Oregon vistas and "all male choruses"(this, truly is a "Manly Musical" without a gay bone in its body and very few women in it). I like "Finian's Rainbow" for Coppola's constantly hip camera moves and some very pretty and/or sexy numbers (Petulia Clark and little-known Don Francks on "That Old Devil Moon" practically melt the screen their sex appeal; Fred Astaires dances up an old man's storm to "Look to the Rainbow.")

Anyway, that's the two I recomend as companions to "Hello,Dolly":

Finian's Rainbow
Paint Your Wagon